Calculus Examples

$x^{2} - x y + y^{2} = 10$ $2 x^{2} + x y - y^{2} = 20$

Step 1

Solve for $x$ in $x^{2} - x y + y^{2} = 10$ .

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Step 1.1

Subtract $10$ from both sides of the equation.

$x^{2} - x y + y^{2} - 10 = 0$

$2 x^{2} + x y - y^{2} = 20$

Step 1.2

Use the quadratic formula to find the solutions.

$\frac{- b \pm \sqrt{b^{2} - 4 (a c)}}{2 a}$

$2 x^{2} + x y - y^{2} = 20$

Step 1.3

Substitute the values $a = 1$ , $b = - y$ , and $c = y^{2} - 10$ into the quadratic formula and solve for $x$ .

$\frac{y \pm \sqrt{{(- y)}^{2} - 4 \cdot (1 \cdot (y^{2} - 10))}}{2 \cdot 1}$

$2 x^{2} + x y - y^{2} = 20$

Step 1.4

Simplify.

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Step 1.4.1

Simplify the numerator.

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Step 1.4.1.1

Apply the product rule to $- y$ .

$x = \frac{y \pm \sqrt{{(- 1)}^{2} y^{2} - 4 \cdot 1 \cdot (y^{2} - 10)}}{2 \cdot 1}$

$2 x^{2} + x y - y^{2} = 20$

Step 1.4.1.2

Raise $- 1$ to the power of $2$ .

$x = \frac{y \pm \sqrt{1 y^{2} - 4 \cdot 1 \cdot (y^{2} - 10)}}{2 \cdot 1}$

$2 x^{2} + x y - y^{2} = 20$

Step 1.4.1.3

Multiply $y^{2}$ by $1$ .

$x = \frac{y \pm \sqrt{y^{2} - 4 \cdot 1 \cdot (y^{2} - 10)}}{2 \cdot 1}$

$2 x^{2} + x y - y^{2} = 20$

Step 1.4.1.4

Multiply $- 4$ by $1$ .

$x = \frac{y \pm \sqrt{y^{2} - 4 \cdot (y^{2} - 10)}}{2 \cdot 1}$

$2 x^{2} + x y - y^{2} = 20$

Step 1.4.1.5

Apply the distributive property.

$x = \frac{y \pm \sqrt{y^{2} - 4 y^{2} - 4 \cdot - 10}}{2 \cdot 1}$

$2 x^{2} + x y - y^{2} = 20$

Step 1.4.1.6

Multiply $- 4$ by $- 10$ .

$x = \frac{y \pm \sqrt{y^{2} - 4 y^{2} + 40}}{2 \cdot 1}$

$2 x^{2} + x y - y^{2} = 20$

Step 1.4.1.7

Subtract $4 y^{2}$ from $y^{2}$ .

$x = \frac{y \pm \sqrt{- 3 y^{2} + 40}}{2 \cdot 1}$

$2 x^{2} + x y - y^{2} = 20$

$x = \frac{y \pm \sqrt{- 3 y^{2} + 40}}{2 \cdot 1}$

$2 x^{2} + x y - y^{2} = 20$

Step 1.4.2

Multiply $2$ by $1$ .

$x = \frac{y \pm \sqrt{- 3 y^{2} + 40}}{2}$

$2 x^{2} + x y - y^{2} = 20$

$x = \frac{y \pm \sqrt{- 3 y^{2} + 40}}{2}$

$2 x^{2} + x y - y^{2} = 20$

Step 1.5

Simplify the expression to solve for the $+$ portion of the $\pm$ .

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Step 1.5.1

Simplify the numerator.

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Step 1.5.1.1

Apply the product rule to $- y$ .

$x = \frac{y \pm \sqrt{{(- 1)}^{2} y^{2} - 4 \cdot 1 \cdot (y^{2} - 10)}}{2 \cdot 1}$

$2 x^{2} + x y - y^{2} = 20$

Step 1.5.1.2

Raise $- 1$ to the power of $2$ .

$x = \frac{y \pm \sqrt{1 y^{2} - 4 \cdot 1 \cdot (y^{2} - 10)}}{2 \cdot 1}$

$2 x^{2} + x y - y^{2} = 20$

Step 1.5.1.3

Multiply $y^{2}$ by $1$ .

$x = \frac{y \pm \sqrt{y^{2} - 4 \cdot 1 \cdot (y^{2} - 10)}}{2 \cdot 1}$

$2 x^{2} + x y - y^{2} = 20$

Step 1.5.1.4

Multiply $- 4$ by $1$ .

$x = \frac{y \pm \sqrt{y^{2} - 4 \cdot (y^{2} - 10)}}{2 \cdot 1}$

$2 x^{2} + x y - y^{2} = 20$

Step 1.5.1.5

Apply the distributive property.

$x = \frac{y \pm \sqrt{y^{2} - 4 y^{2} - 4 \cdot - 10}}{2 \cdot 1}$

$2 x^{2} + x y - y^{2} = 20$

Step 1.5.1.6

Multiply $- 4$ by $- 10$ .

$x = \frac{y \pm \sqrt{y^{2} - 4 y^{2} + 40}}{2 \cdot 1}$

$2 x^{2} + x y - y^{2} = 20$

Step 1.5.1.7

Subtract $4 y^{2}$ from $y^{2}$ .

$x = \frac{y \pm \sqrt{- 3 y^{2} + 40}}{2 \cdot 1}$

$2 x^{2} + x y - y^{2} = 20$

$x = \frac{y \pm \sqrt{- 3 y^{2} + 40}}{2 \cdot 1}$

$2 x^{2} + x y - y^{2} = 20$

Step 1.5.2

Multiply $2$ by $1$ .

$x = \frac{y \pm \sqrt{- 3 y^{2} + 40}}{2}$

$2 x^{2} + x y - y^{2} = 20$

Step 1.5.3

Change the $\pm$ to $+$ .

$x = \frac{y + \sqrt{- 3 y^{2} + 40}}{2}$

$2 x^{2} + x y - y^{2} = 20$

$x = \frac{y + \sqrt{- 3 y^{2} + 40}}{2}$

$2 x^{2} + x y - y^{2} = 20$

Step 1.6

Simplify the expression to solve for the $-$ portion of the $\pm$ .

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Step 1.6.1

Simplify the numerator.

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Step 1.6.1.1

Apply the product rule to $- y$ .

$x = \frac{y \pm \sqrt{{(- 1)}^{2} y^{2} - 4 \cdot 1 \cdot (y^{2} - 10)}}{2 \cdot 1}$

$2 x^{2} + x y - y^{2} = 20$

Step 1.6.1.2

Raise $- 1$ to the power of $2$ .

$x = \frac{y \pm \sqrt{1 y^{2} - 4 \cdot 1 \cdot (y^{2} - 10)}}{2 \cdot 1}$

$2 x^{2} + x y - y^{2} = 20$

Step 1.6.1.3

Multiply $y^{2}$ by $1$ .

$x = \frac{y \pm \sqrt{y^{2} - 4 \cdot 1 \cdot (y^{2} - 10)}}{2 \cdot 1}$

$2 x^{2} + x y - y^{2} = 20$

Step 1.6.1.4

Multiply $- 4$ by $1$ .

$x = \frac{y \pm \sqrt{y^{2} - 4 \cdot (y^{2} - 10)}}{2 \cdot 1}$

$2 x^{2} + x y - y^{2} = 20$

Step 1.6.1.5

Apply the distributive property.

$x = \frac{y \pm \sqrt{y^{2} - 4 y^{2} - 4 \cdot - 10}}{2 \cdot 1}$

$2 x^{2} + x y - y^{2} = 20$

Step 1.6.1.6

Multiply $- 4$ by $- 10$ .

$x = \frac{y \pm \sqrt{y^{2} - 4 y^{2} + 40}}{2 \cdot 1}$

$2 x^{2} + x y - y^{2} = 20$

Step 1.6.1.7

Subtract $4 y^{2}$ from $y^{2}$ .

$x = \frac{y \pm \sqrt{- 3 y^{2} + 40}}{2 \cdot 1}$

$2 x^{2} + x y - y^{2} = 20$

$x = \frac{y \pm \sqrt{- 3 y^{2} + 40}}{2 \cdot 1}$

$2 x^{2} + x y - y^{2} = 20$

Step 1.6.2

Multiply $2$ by $1$ .

$x = \frac{y \pm \sqrt{- 3 y^{2} + 40}}{2}$

$2 x^{2} + x y - y^{2} = 20$

Step 1.6.3

Change the $\pm$ to $-$ .

$x = \frac{y - \sqrt{- 3 y^{2} + 40}}{2}$

$2 x^{2} + x y - y^{2} = 20$

$x = \frac{y - \sqrt{- 3 y^{2} + 40}}{2}$

$2 x^{2} + x y - y^{2} = 20$

Step 1.7

The final answer is the combination of both solutions.

$x = \frac{y + \sqrt{- 3 y^{2} + 40}}{2}$

$x = \frac{y - \sqrt{- 3 y^{2} + 40}}{2}$

$2 x^{2} + x y - y^{2} = 20$

$x = \frac{y + \sqrt{- 3 y^{2} + 40}}{2}$

$x = \frac{y - \sqrt{- 3 y^{2} + 40}}{2}$

$2 x^{2} + x y - y^{2} = 20$

Step 2

Solve the system $x = \frac{y + \sqrt{- 3 y^{2} + 40}}{2}, 2 x^{2} + x y - y^{2} = 20$ .

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Step 2.1

Replace all occurrences of $x$ with $\frac{y + \sqrt{- 3 y^{2} + 40}}{2}$ in each equation.

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Step 2.1.1

Replace all occurrences of $x$ in $2 x^{2} + x y - y^{2} = 20$ with $\frac{y + \sqrt{- 3 y^{2} + 40}}{2}$ .

$2 {(\frac{y + \sqrt{- 3 y^{2} + 40}}{2})}^{2} + (\frac{y + \sqrt{- 3 y^{2} + 40}}{2}) \cdot y - y^{2} = 20$

$x = \frac{y + \sqrt{- 3 y^{2} + 40}}{2}$

Step 2.1.2

Simplify the left side.

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Step 2.1.2.1

Simplify $2 {(\frac{y + \sqrt{- 3 y^{2} + 40}}{2})}^{2} + (\frac{y + \sqrt{- 3 y^{2} + 40}}{2}) \cdot y - y^{2}$ .

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Step 2.1.2.1.1

Simplify each term.

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Step 2.1.2.1.1.1

Apply the product rule to $\frac{y + \sqrt{- 3 y^{2} + 40}}{2}$ .

$2 (\frac{{(y + \sqrt{- 3 y^{2} + 40})}^{2}}{2^{2}}) + (\frac{y + \sqrt{- 3 y^{2} + 40}}{2}) \cdot y - y^{2} = 20$

$x = \frac{y + \sqrt{- 3 y^{2} + 40}}{2}$

Step 2.1.2.1.1.2

Raise $2$ to the power of $2$ .

$2 (\frac{{(y + \sqrt{- 3 y^{2} + 40})}^{2}}{4}) + (\frac{y + \sqrt{- 3 y^{2} + 40}}{2}) \cdot y - y^{2} = 20$

$x = \frac{y + \sqrt{- 3 y^{2} + 40}}{2}$

Step 2.1.2.1.1.3

Cancel the common factor of $2$ .

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Step 2.1.2.1.1.3.1

Factor $2$ out of $4$ .

$2 (\frac{{(y + \sqrt{- 3 y^{2} + 40})}^{2}}{2 (2)}) + (\frac{y + \sqrt{- 3 y^{2} + 40}}{2}) \cdot y - y^{2} = 20$

$x = \frac{y + \sqrt{- 3 y^{2} + 40}}{2}$

Step 2.1.2.1.1.3.2

Cancel the common factor.

$2 (\frac{{(y + \sqrt{- 3 y^{2} + 40})}^{2}}{2 \cdot 2}) + (\frac{y + \sqrt{- 3 y^{2} + 40}}{2}) \cdot y - y^{2} = 20$

$x = \frac{y + \sqrt{- 3 y^{2} + 40}}{2}$

Step 2.1.2.1.1.3.3

Rewrite the expression.

$\frac{{(y + \sqrt{- 3 y^{2} + 40})}^{2}}{2} + (\frac{y + \sqrt{- 3 y^{2} + 40}}{2}) \cdot y - y^{2} = 20$

$x = \frac{y + \sqrt{- 3 y^{2} + 40}}{2}$

$\frac{{(y + \sqrt{- 3 y^{2} + 40})}^{2}}{2} + (\frac{y + \sqrt{- 3 y^{2} + 40}}{2}) \cdot y - y^{2} = 20$

$x = \frac{y + \sqrt{- 3 y^{2} + 40}}{2}$

Step 2.1.2.1.1.4

Rewrite ${(y + \sqrt{- 3 y^{2} + 40})}^{2}$ as $(y + \sqrt{- 3 y^{2} + 40}) (y + \sqrt{- 3 y^{2} + 40})$ .

$\frac{(y + \sqrt{- 3 y^{2} + 40}) (y + \sqrt{- 3 y^{2} + 40})}{2} + (\frac{y + \sqrt{- 3 y^{2} + 40}}{2}) \cdot y - y^{2} = 20$

$x = \frac{y + \sqrt{- 3 y^{2} + 40}}{2}$

Step 2.1.2.1.1.5

Expand $(y + \sqrt{- 3 y^{2} + 40}) (y + \sqrt{- 3 y^{2} + 40})$ using the FOIL Method.

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Step 2.1.2.1.1.5.1

Apply the distributive property.

$\frac{y (y + \sqrt{- 3 y^{2} + 40}) + \sqrt{- 3 y^{2} + 40} (y + \sqrt{- 3 y^{2} + 40})}{2} + (\frac{y + \sqrt{- 3 y^{2} + 40}}{2}) \cdot y - y^{2} = 20$

$x = \frac{y + \sqrt{- 3 y^{2} + 40}}{2}$

Step 2.1.2.1.1.5.2

Apply the distributive property.

$\frac{y \cdot y + y \sqrt{- 3 y^{2} + 40} + \sqrt{- 3 y^{2} + 40} (y + \sqrt{- 3 y^{2} + 40})}{2} + (\frac{y + \sqrt{- 3 y^{2} + 40}}{2}) \cdot y - y^{2} = 20$

$x = \frac{y + \sqrt{- 3 y^{2} + 40}}{2}$

Step 2.1.2.1.1.5.3

Apply the distributive property.

$\frac{y \cdot y + y \sqrt{- 3 y^{2} + 40} + \sqrt{- 3 y^{2} + 40} y + \sqrt{- 3 y^{2} + 40} \sqrt{- 3 y^{2} + 40}}{2} + (\frac{y + \sqrt{- 3 y^{2} + 40}}{2}) \cdot y - y^{2} = 20$

$x = \frac{y + \sqrt{- 3 y^{2} + 40}}{2}$

$\frac{y \cdot y + y \sqrt{- 3 y^{2} + 40} + \sqrt{- 3 y^{2} + 40} y + \sqrt{- 3 y^{2} + 40} \sqrt{- 3 y^{2} + 40}}{2} + (\frac{y + \sqrt{- 3 y^{2} + 40}}{2}) \cdot y - y^{2} = 20$

$x = \frac{y + \sqrt{- 3 y^{2} + 40}}{2}$

Step 2.1.2.1.1.6

Simplify and combine like terms.

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Step 2.1.2.1.1.6.1

Simplify each term.

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Step 2.1.2.1.1.6.1.1

Multiply $y$ by $y$ .

$\frac{y^{2} + y \sqrt{- 3 y^{2} + 40} + \sqrt{- 3 y^{2} + 40} y + \sqrt{- 3 y^{2} + 40} \sqrt{- 3 y^{2} + 40}}{2} + (\frac{y + \sqrt{- 3 y^{2} + 40}}{2}) \cdot y - y^{2} = 20$

$x = \frac{y + \sqrt{- 3 y^{2} + 40}}{2}$

Step 2.1.2.1.1.6.1.2

Multiply $\sqrt{- 3 y^{2} + 40} \sqrt{- 3 y^{2} + 40}$ .

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Step 2.1.2.1.1.6.1.2.1

Raise $\sqrt{- 3 y^{2} + 40}$ to the power of $1$ .

$\frac{y^{2} + y \sqrt{- 3 y^{2} + 40} + \sqrt{- 3 y^{2} + 40} y + \sqrt{- 3 y^{2} + 40} \sqrt{- 3 y^{2} + 40}}{2} + (\frac{y + \sqrt{- 3 y^{2} + 40}}{2}) \cdot y - y^{2} = 20$

$x = \frac{y + \sqrt{- 3 y^{2} + 40}}{2}$

Step 2.1.2.1.1.6.1.2.2

Raise $\sqrt{- 3 y^{2} + 40}$ to the power of $1$ .

$\frac{y^{2} + y \sqrt{- 3 y^{2} + 40} + \sqrt{- 3 y^{2} + 40} y + \sqrt{- 3 y^{2} + 40} \sqrt{- 3 y^{2} + 40}}{2} + (\frac{y + \sqrt{- 3 y^{2} + 40}}{2}) \cdot y - y^{2} = 20$

$x = \frac{y + \sqrt{- 3 y^{2} + 40}}{2}$

Step 2.1.2.1.1.6.1.2.3

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$\frac{y^{2} + y \sqrt{- 3 y^{2} + 40} + \sqrt{- 3 y^{2} + 40} y + {\sqrt{- 3 y^{2} + 40}}^{1 + 1}}{2} + (\frac{y + \sqrt{- 3 y^{2} + 40}}{2}) \cdot y - y^{2} = 20$

$x = \frac{y + \sqrt{- 3 y^{2} + 40}}{2}$

Step 2.1.2.1.1.6.1.2.4

Add $1$ and $1$ .

$\frac{y^{2} + y \sqrt{- 3 y^{2} + 40} + \sqrt{- 3 y^{2} + 40} y + {\sqrt{- 3 y^{2} + 40}}^{2}}{2} + (\frac{y + \sqrt{- 3 y^{2} + 40}}{2}) \cdot y - y^{2} = 20$

$x = \frac{y + \sqrt{- 3 y^{2} + 40}}{2}$

$\frac{y^{2} + y \sqrt{- 3 y^{2} + 40} + \sqrt{- 3 y^{2} + 40} y + {\sqrt{- 3 y^{2} + 40}}^{2}}{2} + (\frac{y + \sqrt{- 3 y^{2} + 40}}{2}) \cdot y - y^{2} = 20$

$x = \frac{y + \sqrt{- 3 y^{2} + 40}}{2}$

Step 2.1.2.1.1.6.1.3

Rewrite ${\sqrt{- 3 y^{2} + 40}}^{2}$ as $- 3 y^{2} + 40$ .

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Step 2.1.2.1.1.6.1.3.1

Use $\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite $\sqrt{- 3 y^{2} + 40}$ as ${(- 3 y^{2} + 40)}^{\frac{1}{2}}$ .

$\frac{y^{2} + y \sqrt{- 3 y^{2} + 40} + \sqrt{- 3 y^{2} + 40} y + {({(- 3 y^{2} + 40)}^{\frac{1}{2}})}^{2}}{2} + (\frac{y + \sqrt{- 3 y^{2} + 40}}{2}) \cdot y - y^{2} = 20$

$x = \frac{y + \sqrt{- 3 y^{2} + 40}}{2}$

Step 2.1.2.1.1.6.1.3.2

Apply the power rule and multiply exponents, ${(a^{m})}^{n} = a^{m n}$ .

$\frac{y^{2} + y \sqrt{- 3 y^{2} + 40} + \sqrt{- 3 y^{2} + 40} y + {(- 3 y^{2} + 40)}^{\frac{1}{2} \cdot 2}}{2} + (\frac{y + \sqrt{- 3 y^{2} + 40}}{2}) \cdot y - y^{2} = 20$

$x = \frac{y + \sqrt{- 3 y^{2} + 40}}{2}$

Step 2.1.2.1.1.6.1.3.3

Combine $\frac{1}{2}$ and $2$ .

$\frac{y^{2} + y \sqrt{- 3 y^{2} + 40} + \sqrt{- 3 y^{2} + 40} y + {(- 3 y^{2} + 40)}^{\frac{2}{2}}}{2} + (\frac{y + \sqrt{- 3 y^{2} + 40}}{2}) \cdot y - y^{2} = 20$

$x = \frac{y + \sqrt{- 3 y^{2} + 40}}{2}$

Step 2.1.2.1.1.6.1.3.4

Cancel the common factor of $2$ .

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Step 2.1.2.1.1.6.1.3.4.1

Cancel the common factor.

$\frac{y^{2} + y \sqrt{- 3 y^{2} + 40} + \sqrt{- 3 y^{2} + 40} y + {(- 3 y^{2} + 40)}^{\frac{2}{2}}}{2} + (\frac{y + \sqrt{- 3 y^{2} + 40}}{2}) \cdot y - y^{2} = 20$

$x = \frac{y + \sqrt{- 3 y^{2} + 40}}{2}$

Step 2.1.2.1.1.6.1.3.4.2

Rewrite the expression.

$\frac{y^{2} + y \sqrt{- 3 y^{2} + 40} + \sqrt{- 3 y^{2} + 40} y - 3 y^{2} + 40}{2} + (\frac{y + \sqrt{- 3 y^{2} + 40}}{2}) \cdot y - y^{2} = 20$

$x = \frac{y + \sqrt{- 3 y^{2} + 40}}{2}$

$\frac{y^{2} + y \sqrt{- 3 y^{2} + 40} + \sqrt{- 3 y^{2} + 40} y - 3 y^{2} + 40}{2} + (\frac{y + \sqrt{- 3 y^{2} + 40}}{2}) \cdot y - y^{2} = 20$

$x = \frac{y + \sqrt{- 3 y^{2} + 40}}{2}$

Step 2.1.2.1.1.6.1.3.5

Simplify.

$\frac{y^{2} + y \sqrt{- 3 y^{2} + 40} + \sqrt{- 3 y^{2} + 40} y - 3 y^{2} + 40}{2} + (\frac{y + \sqrt{- 3 y^{2} + 40}}{2}) \cdot y - y^{2} = 20$

$x = \frac{y + \sqrt{- 3 y^{2} + 40}}{2}$

$\frac{y^{2} + y \sqrt{- 3 y^{2} + 40} + \sqrt{- 3 y^{2} + 40} y - 3 y^{2} + 40}{2} + (\frac{y + \sqrt{- 3 y^{2} + 40}}{2}) \cdot y - y^{2} = 20$

$x = \frac{y + \sqrt{- 3 y^{2} + 40}}{2}$

$\frac{y^{2} + y \sqrt{- 3 y^{2} + 40} + \sqrt{- 3 y^{2} + 40} y - 3 y^{2} + 40}{2} + (\frac{y + \sqrt{- 3 y^{2} + 40}}{2}) \cdot y - y^{2} = 20$

$x = \frac{y + \sqrt{- 3 y^{2} + 40}}{2}$

Step 2.1.2.1.1.6.2

Subtract $3 y^{2}$ from $y^{2}$ .

$\frac{- 2 y^{2} + y \sqrt{- 3 y^{2} + 40} + \sqrt{- 3 y^{2} + 40} y + 40}{2} + (\frac{y + \sqrt{- 3 y^{2} + 40}}{2}) \cdot y - y^{2} = 20$

$x = \frac{y + \sqrt{- 3 y^{2} + 40}}{2}$

Step 2.1.2.1.1.6.3

Reorder the factors of $\sqrt{- 3 y^{2} + 40} y$ .

$\frac{- 2 y^{2} + y \sqrt{- 3 y^{2} + 40} + y \sqrt{- 3 y^{2} + 40} + 40}{2} + (\frac{y + \sqrt{- 3 y^{2} + 40}}{2}) \cdot y - y^{2} = 20$

$x = \frac{y + \sqrt{- 3 y^{2} + 40}}{2}$

Step 2.1.2.1.1.6.4

Add $y \sqrt{- 3 y^{2} + 40}$ and $y \sqrt{- 3 y^{2} + 40}$ .

$\frac{- 2 y^{2} + 2 y \sqrt{- 3 y^{2} + 40} + 40}{2} + (\frac{y + \sqrt{- 3 y^{2} + 40}}{2}) \cdot y - y^{2} = 20$

$x = \frac{y + \sqrt{- 3 y^{2} + 40}}{2}$

$\frac{- 2 y^{2} + 2 y \sqrt{- 3 y^{2} + 40} + 40}{2} + (\frac{y + \sqrt{- 3 y^{2} + 40}}{2}) \cdot y - y^{2} = 20$

$x = \frac{y + \sqrt{- 3 y^{2} + 40}}{2}$

Step 2.1.2.1.1.7

Cancel the common factor of $- 2 y^{2} + 2 y \sqrt{- 3 y^{2} + 40} + 40$ and $2$ .

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Step 2.1.2.1.1.7.1

Factor $2$ out of $- 2 y^{2}$ .

$\frac{2 (- y^{2}) + 2 y \sqrt{- 3 y^{2} + 40} + 40}{2} + (\frac{y + \sqrt{- 3 y^{2} + 40}}{2}) \cdot y - y^{2} = 20$

$x = \frac{y + \sqrt{- 3 y^{2} + 40}}{2}$

Step 2.1.2.1.1.7.2

Factor $2$ out of $2 y \sqrt{- 3 y^{2} + 40}$ .

$\frac{2 (- y^{2}) + 2 (y \sqrt{- 3 y^{2} + 40}) + 40}{2} + (\frac{y + \sqrt{- 3 y^{2} + 40}}{2}) \cdot y - y^{2} = 20$

$x = \frac{y + \sqrt{- 3 y^{2} + 40}}{2}$

Step 2.1.2.1.1.7.3

Factor $2$ out of $2 (- y^{2}) + 2 (y \sqrt{- 3 y^{2} + 40})$ .

$\frac{2 (- y^{2} + y \sqrt{- 3 y^{2} + 40}) + 40}{2} + (\frac{y + \sqrt{- 3 y^{2} + 40}}{2}) \cdot y - y^{2} = 20$

$x = \frac{y + \sqrt{- 3 y^{2} + 40}}{2}$

Step 2.1.2.1.1.7.4

Factor $2$ out of $40$ .

$\frac{2 (- y^{2} + y \sqrt{- 3 y^{2} + 40}) + 2 \cdot 20}{2} + (\frac{y + \sqrt{- 3 y^{2} + 40}}{2}) \cdot y - y^{2} = 20$

$x = \frac{y + \sqrt{- 3 y^{2} + 40}}{2}$

Step 2.1.2.1.1.7.5

Factor $2$ out of $2 (- y^{2} + y \sqrt{- 3 y^{2} + 40}) + 2 (20)$ .

$\frac{2 (- y^{2} + y \sqrt{- 3 y^{2} + 40} + 20)}{2} + (\frac{y + \sqrt{- 3 y^{2} + 40}}{2}) \cdot y - y^{2} = 20$

$x = \frac{y + \sqrt{- 3 y^{2} + 40}}{2}$

Step 2.1.2.1.1.7.6

Cancel the common factors.

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Step 2.1.2.1.1.7.6.1

Factor $2$ out of $2$ .

$\frac{2 (- y^{2} + y \sqrt{- 3 y^{2} + 40} + 20)}{2 (1)} + (\frac{y + \sqrt{- 3 y^{2} + 40}}{2}) \cdot y - y^{2} = 20$

$x = \frac{y + \sqrt{- 3 y^{2} + 40}}{2}$

Step 2.1.2.1.1.7.6.2

Cancel the common factor.

$\frac{2 (- y^{2} + y \sqrt{- 3 y^{2} + 40} + 20)}{2 \cdot 1} + (\frac{y + \sqrt{- 3 y^{2} + 40}}{2}) \cdot y - y^{2} = 20$

$x = \frac{y + \sqrt{- 3 y^{2} + 40}}{2}$

Step 2.1.2.1.1.7.6.3

Rewrite the expression.

$\frac{- y^{2} + y \sqrt{- 3 y^{2} + 40} + 20}{1} + (\frac{y + \sqrt{- 3 y^{2} + 40}}{2}) \cdot y - y^{2} = 20$

$x = \frac{y + \sqrt{- 3 y^{2} + 40}}{2}$

Step 2.1.2.1.1.7.6.4

Divide $- y^{2} + y \sqrt{- 3 y^{2} + 40} + 20$ by $1$ .

$- y^{2} + y \sqrt{- 3 y^{2} + 40} + 20 + (\frac{y + \sqrt{- 3 y^{2} + 40}}{2}) \cdot y - y^{2} = 20$

$x = \frac{y + \sqrt{- 3 y^{2} + 40}}{2}$

$- y^{2} + y \sqrt{- 3 y^{2} + 40} + 20 + (\frac{y + \sqrt{- 3 y^{2} + 40}}{2}) \cdot y - y^{2} = 20$

$x = \frac{y + \sqrt{- 3 y^{2} + 40}}{2}$

$- y^{2} + y \sqrt{- 3 y^{2} + 40} + 20 + (\frac{y + \sqrt{- 3 y^{2} + 40}}{2}) \cdot y - y^{2} = 20$

$x = \frac{y + \sqrt{- 3 y^{2} + 40}}{2}$

Step 2.1.2.1.1.8

Combine $\frac{y + \sqrt{- 3 y^{2} + 40}}{2}$ and $y$ .

$- y^{2} + y \sqrt{- 3 y^{2} + 40} + 20 + \frac{(y + \sqrt{- 3 y^{2} + 40}) y}{2} - y^{2} = 20$

$x = \frac{y + \sqrt{- 3 y^{2} + 40}}{2}$

$- y^{2} + y \sqrt{- 3 y^{2} + 40} + 20 + \frac{(y + \sqrt{- 3 y^{2} + 40}) y}{2} - y^{2} = 20$

$x = \frac{y + \sqrt{- 3 y^{2} + 40}}{2}$

Step 2.1.2.1.2

To write $- y^{2}$ as a fraction with a common denominator, multiply by $\frac{2}{2}$ .

$y \sqrt{- 3 y^{2} + 40} + 20 - y^{2} \cdot \frac{2}{2} + \frac{(y + \sqrt{- 3 y^{2} + 40}) y}{2} - y^{2} = 20$

$x = \frac{y + \sqrt{- 3 y^{2} + 40}}{2}$

Step 2.1.2.1.3

Simplify terms.

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Step 2.1.2.1.3.1

Combine $- y^{2}$ and $\frac{2}{2}$ .

$y \sqrt{- 3 y^{2} + 40} + 20 + \frac{- y^{2} \cdot 2}{2} + \frac{(y + \sqrt{- 3 y^{2} + 40}) y}{2} - y^{2} = 20$

$x = \frac{y + \sqrt{- 3 y^{2} + 40}}{2}$

Step 2.1.2.1.3.2

Combine the numerators over the common denominator.

$y \sqrt{- 3 y^{2} + 40} + 20 + \frac{- y^{2} \cdot 2 + (y + \sqrt{- 3 y^{2} + 40}) y}{2} - y^{2} = 20$

$x = \frac{y + \sqrt{- 3 y^{2} + 40}}{2}$

$y \sqrt{- 3 y^{2} + 40} + 20 + \frac{- y^{2} \cdot 2 + (y + \sqrt{- 3 y^{2} + 40}) y}{2} - y^{2} = 20$

$x = \frac{y + \sqrt{- 3 y^{2} + 40}}{2}$

Step 2.1.2.1.4

Simplify the numerator.

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Step 2.1.2.1.4.1

Factor $y$ out of $- y^{2} \cdot 2 + (y + \sqrt{- 3 y^{2} + 40}) y$ .

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Step 2.1.2.1.4.1.1

Factor $y$ out of $- y^{2} \cdot 2$ .

$y \sqrt{- 3 y^{2} + 40} + 20 + \frac{y (- y \cdot 2) + (y + \sqrt{- 3 y^{2} + 40}) y}{2} - y^{2} = 20$

$x = \frac{y + \sqrt{- 3 y^{2} + 40}}{2}$

Step 2.1.2.1.4.1.2

Factor $y$ out of $(y + \sqrt{- 3 y^{2} + 40}) y$ .

$y \sqrt{- 3 y^{2} + 40} + 20 + \frac{y (- y \cdot 2) + y (y + \sqrt{- 3 y^{2} + 40})}{2} - y^{2} = 20$

$x = \frac{y + \sqrt{- 3 y^{2} + 40}}{2}$

Step 2.1.2.1.4.1.3

Factor $y$ out of $y (- y \cdot 2) + y (y + \sqrt{- 3 y^{2} + 40})$ .

$y \sqrt{- 3 y^{2} + 40} + 20 + \frac{y (- y \cdot 2 + y + \sqrt{- 3 y^{2} + 40})}{2} - y^{2} = 20$

$x = \frac{y + \sqrt{- 3 y^{2} + 40}}{2}$

$y \sqrt{- 3 y^{2} + 40} + 20 + \frac{y (- y \cdot 2 + y + \sqrt{- 3 y^{2} + 40})}{2} - y^{2} = 20$

$x = \frac{y + \sqrt{- 3 y^{2} + 40}}{2}$

Step 2.1.2.1.4.2

Multiply $2$ by $- 1$ .

$y \sqrt{- 3 y^{2} + 40} + 20 + \frac{y (- 2 y + y + \sqrt{- 3 y^{2} + 40})}{2} - y^{2} = 20$

$x = \frac{y + \sqrt{- 3 y^{2} + 40}}{2}$

Step 2.1.2.1.4.3

Add $- 2 y$ and $y$ .

$y \sqrt{- 3 y^{2} + 40} + 20 + \frac{y (- y + \sqrt{- 3 y^{2} + 40})}{2} - y^{2} = 20$

$x = \frac{y + \sqrt{- 3 y^{2} + 40}}{2}$

$y \sqrt{- 3 y^{2} + 40} + 20 + \frac{y (- y + \sqrt{- 3 y^{2} + 40})}{2} - y^{2} = 20$

$x = \frac{y + \sqrt{- 3 y^{2} + 40}}{2}$

Step 2.1.2.1.5

To write $y \sqrt{- 3 y^{2} + 40}$ as a fraction with a common denominator, multiply by $\frac{2}{2}$ .

$y \sqrt{- 3 y^{2} + 40} \cdot \frac{2}{2} + \frac{y (- y + \sqrt{- 3 y^{2} + 40})}{2} + 20 - y^{2} = 20$

$x = \frac{y + \sqrt{- 3 y^{2} + 40}}{2}$

Step 2.1.2.1.6

Simplify terms.

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Step 2.1.2.1.6.1

Combine $y \sqrt{- 3 y^{2} + 40}$ and $\frac{2}{2}$ .

$\frac{y \sqrt{- 3 y^{2} + 40} \cdot 2}{2} + \frac{y (- y + \sqrt{- 3 y^{2} + 40})}{2} + 20 - y^{2} = 20$

$x = \frac{y + \sqrt{- 3 y^{2} + 40}}{2}$

Step 2.1.2.1.6.2

Combine the numerators over the common denominator.

$\frac{y \sqrt{- 3 y^{2} + 40} \cdot 2 + y (- y + \sqrt{- 3 y^{2} + 40})}{2} + 20 - y^{2} = 20$

$x = \frac{y + \sqrt{- 3 y^{2} + 40}}{2}$

$\frac{y \sqrt{- 3 y^{2} + 40} \cdot 2 + y (- y + \sqrt{- 3 y^{2} + 40})}{2} + 20 - y^{2} = 20$

$x = \frac{y + \sqrt{- 3 y^{2} + 40}}{2}$

Step 2.1.2.1.7

Simplify the numerator.

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Step 2.1.2.1.7.1

Factor $y$ out of $y \sqrt{- 3 y^{2} + 40} \cdot 2 + y (- y + \sqrt{- 3 y^{2} + 40})$ .

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Step 2.1.2.1.7.1.1

Factor $y$ out of $y \sqrt{- 3 y^{2} + 40} \cdot 2$ .

$\frac{y (\sqrt{- 3 y^{2} + 40} \cdot 2) + y (- y + \sqrt{- 3 y^{2} + 40})}{2} + 20 - y^{2} = 20$

$x = \frac{y + \sqrt{- 3 y^{2} + 40}}{2}$

Step 2.1.2.1.7.1.2

Factor $y$ out of $y (\sqrt{- 3 y^{2} + 40} \cdot 2) + y (- y + \sqrt{- 3 y^{2} + 40})$ .

$\frac{y (\sqrt{- 3 y^{2} + 40} \cdot 2 - y + \sqrt{- 3 y^{2} + 40})}{2} + 20 - y^{2} = 20$

$x = \frac{y + \sqrt{- 3 y^{2} + 40}}{2}$

$\frac{y (\sqrt{- 3 y^{2} + 40} \cdot 2 - y + \sqrt{- 3 y^{2} + 40})}{2} + 20 - y^{2} = 20$

$x = \frac{y + \sqrt{- 3 y^{2} + 40}}{2}$

Step 2.1.2.1.7.2

Move $2$ to the left of $\sqrt{- 3 y^{2} + 40}$ .

$\frac{y (2 \cdot \sqrt{- 3 y^{2} + 40} - y + \sqrt{- 3 y^{2} + 40})}{2} + 20 - y^{2} = 20$

$x = \frac{y + \sqrt{- 3 y^{2} + 40}}{2}$

Step 2.1.2.1.7.3

Add $2 \sqrt{- 3 y^{2} + 40}$ and $\sqrt{- 3 y^{2} + 40}$ .

$\frac{y (- y + 3 \sqrt{- 3 y^{2} + 40})}{2} + 20 - y^{2} = 20$

$x = \frac{y + \sqrt{- 3 y^{2} + 40}}{2}$

$\frac{y (- y + 3 \sqrt{- 3 y^{2} + 40})}{2} + 20 - y^{2} = 20$

$x = \frac{y + \sqrt{- 3 y^{2} + 40}}{2}$

Step 2.1.2.1.8

To write $20$ as a fraction with a common denominator, multiply by $\frac{2}{2}$ .

$\frac{y (- y + 3 \sqrt{- 3 y^{2} + 40})}{2} + 20 \cdot \frac{2}{2} - y^{2} = 20$

$x = \frac{y + \sqrt{- 3 y^{2} + 40}}{2}$

Step 2.1.2.1.9

Simplify terms.

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Step 2.1.2.1.9.1

Combine $20$ and $\frac{2}{2}$ .

$\frac{y (- y + 3 \sqrt{- 3 y^{2} + 40})}{2} + \frac{20 \cdot 2}{2} - y^{2} = 20$

$x = \frac{y + \sqrt{- 3 y^{2} + 40}}{2}$

Step 2.1.2.1.9.2

Combine the numerators over the common denominator.

$\frac{y (- y + 3 \sqrt{- 3 y^{2} + 40}) + 20 \cdot 2}{2} - y^{2} = 20$

$x = \frac{y + \sqrt{- 3 y^{2} + 40}}{2}$

Step 2.1.2.1.9.3

Multiply $20$ by $2$ .

$\frac{y (- y + 3 \sqrt{- 3 y^{2} + 40}) + 40}{2} - y^{2} = 20$

$x = \frac{y + \sqrt{- 3 y^{2} + 40}}{2}$

$\frac{y (- y + 3 \sqrt{- 3 y^{2} + 40}) + 40}{2} - y^{2} = 20$

$x = \frac{y + \sqrt{- 3 y^{2} + 40}}{2}$

Step 2.1.2.1.10

Simplify the numerator.

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Step 2.1.2.1.10.1

Apply the distributive property.

$\frac{y (- y) + y (3 \sqrt{- 3 y^{2} + 40}) + 40}{2} - y^{2} = 20$

$x = \frac{y + \sqrt{- 3 y^{2} + 40}}{2}$

Step 2.1.2.1.10.2

Rewrite using the commutative property of multiplication.

$\frac{- y \cdot y + y (3 \sqrt{- 3 y^{2} + 40}) + 40}{2} - y^{2} = 20$

$x = \frac{y + \sqrt{- 3 y^{2} + 40}}{2}$

Step 2.1.2.1.10.3

Rewrite using the commutative property of multiplication.

$\frac{- y \cdot y + 3 y \sqrt{- 3 y^{2} + 40} + 40}{2} - y^{2} = 20$

$x = \frac{y + \sqrt{- 3 y^{2} + 40}}{2}$

Step 2.1.2.1.10.4

Multiply $y$ by $y$ by adding the exponents.

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Step 2.1.2.1.10.4.1

Move $y$ .

$\frac{- (y \cdot y) + 3 y \sqrt{- 3 y^{2} + 40} + 40}{2} - y^{2} = 20$

$x = \frac{y + \sqrt{- 3 y^{2} + 40}}{2}$

Step 2.1.2.1.10.4.2

Multiply $y$ by $y$ .

$\frac{- y^{2} + 3 y \sqrt{- 3 y^{2} + 40} + 40}{2} - y^{2} = 20$

$x = \frac{y + \sqrt{- 3 y^{2} + 40}}{2}$

$\frac{- y^{2} + 3 y \sqrt{- 3 y^{2} + 40} + 40}{2} - y^{2} = 20$

$x = \frac{y + \sqrt{- 3 y^{2} + 40}}{2}$

$\frac{- y^{2} + 3 y \sqrt{- 3 y^{2} + 40} + 40}{2} - y^{2} = 20$

$x = \frac{y + \sqrt{- 3 y^{2} + 40}}{2}$

$\frac{- y^{2} + 3 y \sqrt{- 3 y^{2} + 40} + 40}{2} - y^{2} = 20$

$x = \frac{y + \sqrt{- 3 y^{2} + 40}}{2}$

$\frac{- y^{2} + 3 y \sqrt{- 3 y^{2} + 40} + 40}{2} - y^{2} = 20$

$x = \frac{y + \sqrt{- 3 y^{2} + 40}}{2}$

$\frac{- y^{2} + 3 y \sqrt{- 3 y^{2} + 40} + 40}{2} - y^{2} = 20$

$x = \frac{y + \sqrt{- 3 y^{2} + 40}}{2}$

Step 2.2

Graph each side of the equation. The solution is the x-value of the point of intersection.

$y = 0, \sqrt{10}$

$x = \frac{y + \sqrt{- 3 y^{2} + 40}}{2}$

Step 2.3

Replace all occurrences of $y$ with $0$ in each equation.

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Step 2.3.1

Replace all occurrences of $y$ in $x = \frac{y + \sqrt{- 3 y^{2} + 40}}{2}$ with $0$ .

$x = \frac{(0) + \sqrt{- 3 {(0)}^{2} + 40}}{2}$

$y = 0$

Step 2.3.2

Simplify the right side.

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Step 2.3.2.1

Simplify $\frac{(0) + \sqrt{- 3 {(0)}^{2} + 40}}{2}$ .

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Step 2.3.2.1.1

Simplify the numerator.

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Step 2.3.2.1.1.1

Raising $0$ to any positive power yields $0$ .

$x = \frac{0 + \sqrt{- 3 \cdot 0 + 40}}{2}$

$y = 0$

Step 2.3.2.1.1.2

Multiply $- 3$ by $0$ .

$x = \frac{0 + \sqrt{0 + 40}}{2}$

$y = 0$

Step 2.3.2.1.1.3

Add $0$ and $40$ .

$x = \frac{0 + \sqrt{40}}{2}$

$y = 0$

Step 2.3.2.1.1.4

Rewrite $40$ as $2^{2} \cdot 10$ .

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Step 2.3.2.1.1.4.1

Factor $4$ out of $40$ .

$x = \frac{0 + \sqrt{4 (10)}}{2}$

$y = 0$

Step 2.3.2.1.1.4.2

Rewrite $4$ as $2^{2}$ .

$x = \frac{0 + \sqrt{2^{2} \cdot 10}}{2}$

$y = 0$

$x = \frac{0 + \sqrt{2^{2} \cdot 10}}{2}$

$y = 0$

Step 2.3.2.1.1.5

Pull terms out from under the radical.

$x = \frac{0 + 2 \sqrt{10}}{2}$

$y = 0$

Step 2.3.2.1.1.6

Add $0$ and $2 \sqrt{10}$ .

$x = \frac{2 \sqrt{10}}{2}$

$y = 0$

$x = \frac{2 \sqrt{10}}{2}$

$y = 0$

Step 2.3.2.1.2

Cancel the common factor of $2$ .

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Step 2.3.2.1.2.1

Cancel the common factor.

$x = \frac{2 \sqrt{10}}{2}$

$y = 0$

Step 2.3.2.1.2.2

Divide $\sqrt{10}$ by $1$ .

$x = \sqrt{10}$

$y = 0$

$x = \sqrt{10}$

$y = 0$

$x = \sqrt{10}$

$y = 0$

$x = \sqrt{10}$

$y = 0$

$x = \sqrt{10}$

$y = 0$

Step 2.4

Replace all occurrences of $y$ with $\sqrt{10}$ in each equation.

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Step 2.4.1

Replace all occurrences of $y$ in $x = \frac{y + \sqrt{- 3 y^{2} + 40}}{2}$ with $\sqrt{10}$ .

$x = \frac{(\sqrt{10}) + \sqrt{- 3 {(\sqrt{10})}^{2} + 40}}{2}$

$y = \sqrt{10}$

Step 2.4.2

Simplify the right side.

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Step 2.4.2.1

Simplify $\frac{(\sqrt{10}) + \sqrt{- 3 {(\sqrt{10})}^{2} + 40}}{2}$ .

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Step 2.4.2.1.1

Simplify the numerator.

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Step 2.4.2.1.1.1

Rewrite ${\sqrt{10}}^{2}$ as $10$ .

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Step 2.4.2.1.1.1.1

Use $\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite $\sqrt{10}$ as $10^{\frac{1}{2}}$ .

$x = \frac{\sqrt{10} + \sqrt{- 3 {(10^{\frac{1}{2}})}^{2} + 40}}{2}$

$y = \sqrt{10}$

Step 2.4.2.1.1.1.2

Apply the power rule and multiply exponents, ${(a^{m})}^{n} = a^{m n}$ .

$x = \frac{\sqrt{10} + \sqrt{- 3 \cdot 10^{\frac{1}{2} \cdot 2} + 40}}{2}$

$y = \sqrt{10}$

Step 2.4.2.1.1.1.3

Combine $\frac{1}{2}$ and $2$ .

$x = \frac{\sqrt{10} + \sqrt{- 3 \cdot 10^{\frac{2}{2}} + 40}}{2}$

$y = \sqrt{10}$

Step 2.4.2.1.1.1.4

Cancel the common factor of $2$ .

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Step 2.4.2.1.1.1.4.1

Cancel the common factor.

$x = \frac{\sqrt{10} + \sqrt{- 3 \cdot 10^{\frac{2}{2}} + 40}}{2}$

$y = \sqrt{10}$

Step 2.4.2.1.1.1.4.2

Rewrite the expression.

$x = \frac{\sqrt{10} + \sqrt{- 3 \cdot 10 + 40}}{2}$

$y = \sqrt{10}$

$x = \frac{\sqrt{10} + \sqrt{- 3 \cdot 10 + 40}}{2}$

$y = \sqrt{10}$

Step 2.4.2.1.1.1.5

Evaluate the exponent.

$x = \frac{\sqrt{10} + \sqrt{- 3 \cdot 10 + 40}}{2}$

$y = \sqrt{10}$

$x = \frac{\sqrt{10} + \sqrt{- 3 \cdot 10 + 40}}{2}$

$y = \sqrt{10}$

Step 2.4.2.1.1.2

Multiply $- 3$ by $10$ .

$x = \frac{\sqrt{10} + \sqrt{- 30 + 40}}{2}$

$y = \sqrt{10}$

Step 2.4.2.1.1.3

Add $- 30$ and $40$ .

$x = \frac{\sqrt{10} + \sqrt{10}}{2}$

$y = \sqrt{10}$

Step 2.4.2.1.1.4

Add $\sqrt{10}$ and $\sqrt{10}$ .

$x = \frac{2 \sqrt{10}}{2}$

$y = \sqrt{10}$

$x = \frac{2 \sqrt{10}}{2}$

$y = \sqrt{10}$

Step 2.4.2.1.2

Cancel the common factor of $2$ .

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Step 2.4.2.1.2.1

Cancel the common factor.

$x = \frac{2 \sqrt{10}}{2}$

$y = \sqrt{10}$

Step 2.4.2.1.2.2

Divide $\sqrt{10}$ by $1$ .

$x = \sqrt{10}$

$y = \sqrt{10}$

$x = \sqrt{10}$

$y = \sqrt{10}$

$x = \sqrt{10}$

$y = \sqrt{10}$

$x = \sqrt{10}$

$y = \sqrt{10}$

$x = \sqrt{10}$

$y = \sqrt{10}$

$x = \sqrt{10}$

$y = \sqrt{10}$

Step 3

Solve the system $x = \frac{y - \sqrt{- 3 y^{2} + 40}}{2}, 2 x^{2} + x y - y^{2} = 20$ .

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Step 3.1

Replace all occurrences of $x$ with $\frac{y - \sqrt{- 3 y^{2} + 40}}{2}$ in each equation.

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Step 3.1.1

Replace all occurrences of $x$ in $2 x^{2} + x y - y^{2} = 20$ with $\frac{y - \sqrt{- 3 y^{2} + 40}}{2}$ .

$2 {(\frac{y - \sqrt{- 3 y^{2} + 40}}{2})}^{2} + (\frac{y - \sqrt{- 3 y^{2} + 40}}{2}) \cdot y - y^{2} = 20$

$x = \frac{y - \sqrt{- 3 y^{2} + 40}}{2}$

Step 3.1.2

Simplify the left side.

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Step 3.1.2.1

Simplify $2 {(\frac{y - \sqrt{- 3 y^{2} + 40}}{2})}^{2} + (\frac{y - \sqrt{- 3 y^{2} + 40}}{2}) \cdot y - y^{2}$ .

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Step 3.1.2.1.1

Simplify each term.

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Step 3.1.2.1.1.1

Apply the product rule to $\frac{y - \sqrt{- 3 y^{2} + 40}}{2}$ .

$2 (\frac{{(y - \sqrt{- 3 y^{2} + 40})}^{2}}{2^{2}}) + (\frac{y - \sqrt{- 3 y^{2} + 40}}{2}) \cdot y - y^{2} = 20$

$x = \frac{y - \sqrt{- 3 y^{2} + 40}}{2}$

Step 3.1.2.1.1.2

Raise $2$ to the power of $2$ .

$2 (\frac{{(y - \sqrt{- 3 y^{2} + 40})}^{2}}{4}) + (\frac{y - \sqrt{- 3 y^{2} + 40}}{2}) \cdot y - y^{2} = 20$

$x = \frac{y - \sqrt{- 3 y^{2} + 40}}{2}$

Step 3.1.2.1.1.3

Cancel the common factor of $2$ .

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Step 3.1.2.1.1.3.1

Factor $2$ out of $4$ .

$2 (\frac{{(y - \sqrt{- 3 y^{2} + 40})}^{2}}{2 (2)}) + (\frac{y - \sqrt{- 3 y^{2} + 40}}{2}) \cdot y - y^{2} = 20$

$x = \frac{y - \sqrt{- 3 y^{2} + 40}}{2}$

Step 3.1.2.1.1.3.2

Cancel the common factor.

$2 (\frac{{(y - \sqrt{- 3 y^{2} + 40})}^{2}}{2 \cdot 2}) + (\frac{y - \sqrt{- 3 y^{2} + 40}}{2}) \cdot y - y^{2} = 20$

$x = \frac{y - \sqrt{- 3 y^{2} + 40}}{2}$

Step 3.1.2.1.1.3.3

Rewrite the expression.

$\frac{{(y - \sqrt{- 3 y^{2} + 40})}^{2}}{2} + (\frac{y - \sqrt{- 3 y^{2} + 40}}{2}) \cdot y - y^{2} = 20$

$x = \frac{y - \sqrt{- 3 y^{2} + 40}}{2}$

$\frac{{(y - \sqrt{- 3 y^{2} + 40})}^{2}}{2} + (\frac{y - \sqrt{- 3 y^{2} + 40}}{2}) \cdot y - y^{2} = 20$

$x = \frac{y - \sqrt{- 3 y^{2} + 40}}{2}$

Step 3.1.2.1.1.4

Rewrite ${(y - \sqrt{- 3 y^{2} + 40})}^{2}$ as $(y - \sqrt{- 3 y^{2} + 40}) (y - \sqrt{- 3 y^{2} + 40})$ .

$\frac{(y - \sqrt{- 3 y^{2} + 40}) (y - \sqrt{- 3 y^{2} + 40})}{2} + (\frac{y - \sqrt{- 3 y^{2} + 40}}{2}) \cdot y - y^{2} = 20$

$x = \frac{y - \sqrt{- 3 y^{2} + 40}}{2}$

Step 3.1.2.1.1.5

Expand $(y - \sqrt{- 3 y^{2} + 40}) (y - \sqrt{- 3 y^{2} + 40})$ using the FOIL Method.

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Step 3.1.2.1.1.5.1

Apply the distributive property.

$\frac{y (y - \sqrt{- 3 y^{2} + 40}) - \sqrt{- 3 y^{2} + 40} (y - \sqrt{- 3 y^{2} + 40})}{2} + (\frac{y - \sqrt{- 3 y^{2} + 40}}{2}) \cdot y - y^{2} = 20$

$x = \frac{y - \sqrt{- 3 y^{2} + 40}}{2}$

Step 3.1.2.1.1.5.2

Apply the distributive property.

$\frac{y \cdot y + y (- \sqrt{- 3 y^{2} + 40}) - \sqrt{- 3 y^{2} + 40} (y - \sqrt{- 3 y^{2} + 40})}{2} + (\frac{y - \sqrt{- 3 y^{2} + 40}}{2}) \cdot y - y^{2} = 20$

$x = \frac{y - \sqrt{- 3 y^{2} + 40}}{2}$

Step 3.1.2.1.1.5.3

Apply the distributive property.

$\frac{y \cdot y + y (- \sqrt{- 3 y^{2} + 40}) - \sqrt{- 3 y^{2} + 40} y - \sqrt{- 3 y^{2} + 40} (- \sqrt{- 3 y^{2} + 40})}{2} + (\frac{y - \sqrt{- 3 y^{2} + 40}}{2}) \cdot y - y^{2} = 20$

$x = \frac{y - \sqrt{- 3 y^{2} + 40}}{2}$

$\frac{y \cdot y + y (- \sqrt{- 3 y^{2} + 40}) - \sqrt{- 3 y^{2} + 40} y - \sqrt{- 3 y^{2} + 40} (- \sqrt{- 3 y^{2} + 40})}{2} + (\frac{y - \sqrt{- 3 y^{2} + 40}}{2}) \cdot y - y^{2} = 20$

$x = \frac{y - \sqrt{- 3 y^{2} + 40}}{2}$

Step 3.1.2.1.1.6

Simplify and combine like terms.

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Step 3.1.2.1.1.6.1

Simplify each term.

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Step 3.1.2.1.1.6.1.1

Multiply $y$ by $y$ .

$\frac{y^{2} + y (- \sqrt{- 3 y^{2} + 40}) - \sqrt{- 3 y^{2} + 40} y - \sqrt{- 3 y^{2} + 40} (- \sqrt{- 3 y^{2} + 40})}{2} + (\frac{y - \sqrt{- 3 y^{2} + 40}}{2}) \cdot y - y^{2} = 20$

$x = \frac{y - \sqrt{- 3 y^{2} + 40}}{2}$

Step 3.1.2.1.1.6.1.2

Rewrite using the commutative property of multiplication.

$\frac{y^{2} - y \sqrt{- 3 y^{2} + 40} - \sqrt{- 3 y^{2} + 40} y - \sqrt{- 3 y^{2} + 40} (- \sqrt{- 3 y^{2} + 40})}{2} + (\frac{y - \sqrt{- 3 y^{2} + 40}}{2}) \cdot y - y^{2} = 20$

$x = \frac{y - \sqrt{- 3 y^{2} + 40}}{2}$

Step 3.1.2.1.1.6.1.3

Multiply $- \sqrt{- 3 y^{2} + 40} (- \sqrt{- 3 y^{2} + 40})$ .

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Step 3.1.2.1.1.6.1.3.1

Multiply $- 1$ by $- 1$ .

$\frac{y^{2} - y \sqrt{- 3 y^{2} + 40} - \sqrt{- 3 y^{2} + 40} y + 1 \sqrt{- 3 y^{2} + 40} \sqrt{- 3 y^{2} + 40}}{2} + (\frac{y - \sqrt{- 3 y^{2} + 40}}{2}) \cdot y - y^{2} = 20$

$x = \frac{y - \sqrt{- 3 y^{2} + 40}}{2}$

Step 3.1.2.1.1.6.1.3.2

Multiply $\sqrt{- 3 y^{2} + 40}$ by $1$ .

$\frac{y^{2} - y \sqrt{- 3 y^{2} + 40} - \sqrt{- 3 y^{2} + 40} y + \sqrt{- 3 y^{2} + 40} \sqrt{- 3 y^{2} + 40}}{2} + (\frac{y - \sqrt{- 3 y^{2} + 40}}{2}) \cdot y - y^{2} = 20$

$x = \frac{y - \sqrt{- 3 y^{2} + 40}}{2}$

Step 3.1.2.1.1.6.1.3.3

Raise $\sqrt{- 3 y^{2} + 40}$ to the power of $1$ .

$\frac{y^{2} - y \sqrt{- 3 y^{2} + 40} - \sqrt{- 3 y^{2} + 40} y + \sqrt{- 3 y^{2} + 40} \sqrt{- 3 y^{2} + 40}}{2} + (\frac{y - \sqrt{- 3 y^{2} + 40}}{2}) \cdot y - y^{2} = 20$

$x = \frac{y - \sqrt{- 3 y^{2} + 40}}{2}$

Step 3.1.2.1.1.6.1.3.4

Raise $\sqrt{- 3 y^{2} + 40}$ to the power of $1$ .

$\frac{y^{2} - y \sqrt{- 3 y^{2} + 40} - \sqrt{- 3 y^{2} + 40} y + \sqrt{- 3 y^{2} + 40} \sqrt{- 3 y^{2} + 40}}{2} + (\frac{y - \sqrt{- 3 y^{2} + 40}}{2}) \cdot y - y^{2} = 20$

$x = \frac{y - \sqrt{- 3 y^{2} + 40}}{2}$

Step 3.1.2.1.1.6.1.3.5

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$\frac{y^{2} - y \sqrt{- 3 y^{2} + 40} - \sqrt{- 3 y^{2} + 40} y + {\sqrt{- 3 y^{2} + 40}}^{1 + 1}}{2} + (\frac{y - \sqrt{- 3 y^{2} + 40}}{2}) \cdot y - y^{2} = 20$

$x = \frac{y - \sqrt{- 3 y^{2} + 40}}{2}$

Step 3.1.2.1.1.6.1.3.6

Add $1$ and $1$ .

$\frac{y^{2} - y \sqrt{- 3 y^{2} + 40} - \sqrt{- 3 y^{2} + 40} y + {\sqrt{- 3 y^{2} + 40}}^{2}}{2} + (\frac{y - \sqrt{- 3 y^{2} + 40}}{2}) \cdot y - y^{2} = 20$

$x = \frac{y - \sqrt{- 3 y^{2} + 40}}{2}$

$\frac{y^{2} - y \sqrt{- 3 y^{2} + 40} - \sqrt{- 3 y^{2} + 40} y + {\sqrt{- 3 y^{2} + 40}}^{2}}{2} + (\frac{y - \sqrt{- 3 y^{2} + 40}}{2}) \cdot y - y^{2} = 20$

$x = \frac{y - \sqrt{- 3 y^{2} + 40}}{2}$

Step 3.1.2.1.1.6.1.4

Rewrite ${\sqrt{- 3 y^{2} + 40}}^{2}$ as $- 3 y^{2} + 40$ .

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Step 3.1.2.1.1.6.1.4.1

Use $\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite $\sqrt{- 3 y^{2} + 40}$ as ${(- 3 y^{2} + 40)}^{\frac{1}{2}}$ .

$\frac{y^{2} - y \sqrt{- 3 y^{2} + 40} - \sqrt{- 3 y^{2} + 40} y + {({(- 3 y^{2} + 40)}^{\frac{1}{2}})}^{2}}{2} + (\frac{y - \sqrt{- 3 y^{2} + 40}}{2}) \cdot y - y^{2} = 20$

$x = \frac{y - \sqrt{- 3 y^{2} + 40}}{2}$

Step 3.1.2.1.1.6.1.4.2

Apply the power rule and multiply exponents, ${(a^{m})}^{n} = a^{m n}$ .

$\frac{y^{2} - y \sqrt{- 3 y^{2} + 40} - \sqrt{- 3 y^{2} + 40} y + {(- 3 y^{2} + 40)}^{\frac{1}{2} \cdot 2}}{2} + (\frac{y - \sqrt{- 3 y^{2} + 40}}{2}) \cdot y - y^{2} = 20$

$x = \frac{y - \sqrt{- 3 y^{2} + 40}}{2}$

Step 3.1.2.1.1.6.1.4.3

Combine $\frac{1}{2}$ and $2$ .

$\frac{y^{2} - y \sqrt{- 3 y^{2} + 40} - \sqrt{- 3 y^{2} + 40} y + {(- 3 y^{2} + 40)}^{\frac{2}{2}}}{2} + (\frac{y - \sqrt{- 3 y^{2} + 40}}{2}) \cdot y - y^{2} = 20$

$x = \frac{y - \sqrt{- 3 y^{2} + 40}}{2}$

Step 3.1.2.1.1.6.1.4.4

Cancel the common factor of $2$ .

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Step 3.1.2.1.1.6.1.4.4.1

Cancel the common factor.

$\frac{y^{2} - y \sqrt{- 3 y^{2} + 40} - \sqrt{- 3 y^{2} + 40} y + {(- 3 y^{2} + 40)}^{\frac{2}{2}}}{2} + (\frac{y - \sqrt{- 3 y^{2} + 40}}{2}) \cdot y - y^{2} = 20$

$x = \frac{y - \sqrt{- 3 y^{2} + 40}}{2}$

Step 3.1.2.1.1.6.1.4.4.2

Rewrite the expression.

$\frac{y^{2} - y \sqrt{- 3 y^{2} + 40} - \sqrt{- 3 y^{2} + 40} y - 3 y^{2} + 40}{2} + (\frac{y - \sqrt{- 3 y^{2} + 40}}{2}) \cdot y - y^{2} = 20$

$x = \frac{y - \sqrt{- 3 y^{2} + 40}}{2}$

$\frac{y^{2} - y \sqrt{- 3 y^{2} + 40} - \sqrt{- 3 y^{2} + 40} y - 3 y^{2} + 40}{2} + (\frac{y - \sqrt{- 3 y^{2} + 40}}{2}) \cdot y - y^{2} = 20$

$x = \frac{y - \sqrt{- 3 y^{2} + 40}}{2}$

Step 3.1.2.1.1.6.1.4.5

Simplify.

$\frac{y^{2} - y \sqrt{- 3 y^{2} + 40} - \sqrt{- 3 y^{2} + 40} y - 3 y^{2} + 40}{2} + (\frac{y - \sqrt{- 3 y^{2} + 40}}{2}) \cdot y - y^{2} = 20$

$x = \frac{y - \sqrt{- 3 y^{2} + 40}}{2}$

$\frac{y^{2} - y \sqrt{- 3 y^{2} + 40} - \sqrt{- 3 y^{2} + 40} y - 3 y^{2} + 40}{2} + (\frac{y - \sqrt{- 3 y^{2} + 40}}{2}) \cdot y - y^{2} = 20$

$x = \frac{y - \sqrt{- 3 y^{2} + 40}}{2}$

$\frac{y^{2} - y \sqrt{- 3 y^{2} + 40} - \sqrt{- 3 y^{2} + 40} y - 3 y^{2} + 40}{2} + (\frac{y - \sqrt{- 3 y^{2} + 40}}{2}) \cdot y - y^{2} = 20$

$x = \frac{y - \sqrt{- 3 y^{2} + 40}}{2}$

Step 3.1.2.1.1.6.2

Subtract $3 y^{2}$ from $y^{2}$ .

$\frac{- 2 y^{2} - y \sqrt{- 3 y^{2} + 40} - \sqrt{- 3 y^{2} + 40} y + 40}{2} + (\frac{y - \sqrt{- 3 y^{2} + 40}}{2}) \cdot y - y^{2} = 20$

$x = \frac{y - \sqrt{- 3 y^{2} + 40}}{2}$

Step 3.1.2.1.1.6.3

Reorder the factors of $- \sqrt{- 3 y^{2} + 40} y$ .

$\frac{- 2 y^{2} - y \sqrt{- 3 y^{2} + 40} - y \sqrt{- 3 y^{2} + 40} + 40}{2} + (\frac{y - \sqrt{- 3 y^{2} + 40}}{2}) \cdot y - y^{2} = 20$

$x = \frac{y - \sqrt{- 3 y^{2} + 40}}{2}$

Step 3.1.2.1.1.6.4

Subtract $y \sqrt{- 3 y^{2} + 40}$ from $- y \sqrt{- 3 y^{2} + 40}$ .

$\frac{- 2 y^{2} - 2 y \sqrt{- 3 y^{2} + 40} + 40}{2} + (\frac{y - \sqrt{- 3 y^{2} + 40}}{2}) \cdot y - y^{2} = 20$

$x = \frac{y - \sqrt{- 3 y^{2} + 40}}{2}$

$\frac{- 2 y^{2} - 2 y \sqrt{- 3 y^{2} + 40} + 40}{2} + (\frac{y - \sqrt{- 3 y^{2} + 40}}{2}) \cdot y - y^{2} = 20$

$x = \frac{y - \sqrt{- 3 y^{2} + 40}}{2}$

Step 3.1.2.1.1.7

Cancel the common factor of $- 2 y^{2} - 2 y \sqrt{- 3 y^{2} + 40} + 40$ and $2$ .

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Step 3.1.2.1.1.7.1

Factor $2$ out of $- 2 y^{2}$ .

$\frac{2 (- y^{2}) - 2 y \sqrt{- 3 y^{2} + 40} + 40}{2} + (\frac{y - \sqrt{- 3 y^{2} + 40}}{2}) \cdot y - y^{2} = 20$

$x = \frac{y - \sqrt{- 3 y^{2} + 40}}{2}$

Step 3.1.2.1.1.7.2

Factor $2$ out of $- 2 y \sqrt{- 3 y^{2} + 40}$ .

$\frac{2 (- y^{2}) + 2 (- y \sqrt{- 3 y^{2} + 40}) + 40}{2} + (\frac{y - \sqrt{- 3 y^{2} + 40}}{2}) \cdot y - y^{2} = 20$

$x = \frac{y - \sqrt{- 3 y^{2} + 40}}{2}$

Step 3.1.2.1.1.7.3

Factor $2$ out of $2 (- y^{2}) + 2 (- y \sqrt{- 3 y^{2} + 40})$ .

$\frac{2 (- y^{2} - y \sqrt{- 3 y^{2} + 40}) + 40}{2} + (\frac{y - \sqrt{- 3 y^{2} + 40}}{2}) \cdot y - y^{2} = 20$

$x = \frac{y - \sqrt{- 3 y^{2} + 40}}{2}$

Step 3.1.2.1.1.7.4

Factor $2$ out of $40$ .

$\frac{2 (- y^{2} - y \sqrt{- 3 y^{2} + 40}) + 2 \cdot 20}{2} + (\frac{y - \sqrt{- 3 y^{2} + 40}}{2}) \cdot y - y^{2} = 20$

$x = \frac{y - \sqrt{- 3 y^{2} + 40}}{2}$

Step 3.1.2.1.1.7.5

Factor $2$ out of $2 (- y^{2} - y \sqrt{- 3 y^{2} + 40}) + 2 (20)$ .

$\frac{2 (- y^{2} - y \sqrt{- 3 y^{2} + 40} + 20)}{2} + (\frac{y - \sqrt{- 3 y^{2} + 40}}{2}) \cdot y - y^{2} = 20$

$x = \frac{y - \sqrt{- 3 y^{2} + 40}}{2}$

Step 3.1.2.1.1.7.6

Cancel the common factors.

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Step 3.1.2.1.1.7.6.1

Factor $2$ out of $2$ .

$\frac{2 (- y^{2} - y \sqrt{- 3 y^{2} + 40} + 20)}{2 (1)} + (\frac{y - \sqrt{- 3 y^{2} + 40}}{2}) \cdot y - y^{2} = 20$

$x = \frac{y - \sqrt{- 3 y^{2} + 40}}{2}$

Step 3.1.2.1.1.7.6.2

Cancel the common factor.

$\frac{2 (- y^{2} - y \sqrt{- 3 y^{2} + 40} + 20)}{2 \cdot 1} + (\frac{y - \sqrt{- 3 y^{2} + 40}}{2}) \cdot y - y^{2} = 20$

$x = \frac{y - \sqrt{- 3 y^{2} + 40}}{2}$

Step 3.1.2.1.1.7.6.3

Rewrite the expression.

$\frac{- y^{2} - y \sqrt{- 3 y^{2} + 40} + 20}{1} + (\frac{y - \sqrt{- 3 y^{2} + 40}}{2}) \cdot y - y^{2} = 20$

$x = \frac{y - \sqrt{- 3 y^{2} + 40}}{2}$

Step 3.1.2.1.1.7.6.4

Divide $- y^{2} - y \sqrt{- 3 y^{2} + 40} + 20$ by $1$ .

$- y^{2} - y \sqrt{- 3 y^{2} + 40} + 20 + (\frac{y - \sqrt{- 3 y^{2} + 40}}{2}) \cdot y - y^{2} = 20$

$x = \frac{y - \sqrt{- 3 y^{2} + 40}}{2}$

$- y^{2} - y \sqrt{- 3 y^{2} + 40} + 20 + (\frac{y - \sqrt{- 3 y^{2} + 40}}{2}) \cdot y - y^{2} = 20$

$x = \frac{y - \sqrt{- 3 y^{2} + 40}}{2}$

$- y^{2} - y \sqrt{- 3 y^{2} + 40} + 20 + (\frac{y - \sqrt{- 3 y^{2} + 40}}{2}) \cdot y - y^{2} = 20$

$x = \frac{y - \sqrt{- 3 y^{2} + 40}}{2}$

Step 3.1.2.1.1.8

Combine $\frac{y - \sqrt{- 3 y^{2} + 40}}{2}$ and $y$ .

$- y^{2} - y \sqrt{- 3 y^{2} + 40} + 20 + \frac{(y - \sqrt{- 3 y^{2} + 40}) y}{2} - y^{2} = 20$

$x = \frac{y - \sqrt{- 3 y^{2} + 40}}{2}$

$- y^{2} - y \sqrt{- 3 y^{2} + 40} + 20 + \frac{(y - \sqrt{- 3 y^{2} + 40}) y}{2} - y^{2} = 20$

$x = \frac{y - \sqrt{- 3 y^{2} + 40}}{2}$

Step 3.1.2.1.2

To write $- y^{2}$ as a fraction with a common denominator, multiply by $\frac{2}{2}$ .

$- y \sqrt{- 3 y^{2} + 40} + 20 - y^{2} \cdot \frac{2}{2} + \frac{(y - \sqrt{- 3 y^{2} + 40}) y}{2} - y^{2} = 20$

$x = \frac{y - \sqrt{- 3 y^{2} + 40}}{2}$

Step 3.1.2.1.3

Simplify terms.

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Step 3.1.2.1.3.1

Combine $- y^{2}$ and $\frac{2}{2}$ .

$- y \sqrt{- 3 y^{2} + 40} + 20 + \frac{- y^{2} \cdot 2}{2} + \frac{(y - \sqrt{- 3 y^{2} + 40}) y}{2} - y^{2} = 20$

$x = \frac{y - \sqrt{- 3 y^{2} + 40}}{2}$

Step 3.1.2.1.3.2

Combine the numerators over the common denominator.

$- y \sqrt{- 3 y^{2} + 40} + 20 + \frac{- y^{2} \cdot 2 + (y - \sqrt{- 3 y^{2} + 40}) y}{2} - y^{2} = 20$

$x = \frac{y - \sqrt{- 3 y^{2} + 40}}{2}$

$- y \sqrt{- 3 y^{2} + 40} + 20 + \frac{- y^{2} \cdot 2 + (y - \sqrt{- 3 y^{2} + 40}) y}{2} - y^{2} = 20$

$x = \frac{y - \sqrt{- 3 y^{2} + 40}}{2}$

Step 3.1.2.1.4

Simplify the numerator.

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Step 3.1.2.1.4.1

Factor $y$ out of $- y^{2} \cdot 2 + (y - \sqrt{- 3 y^{2} + 40}) y$ .

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Step 3.1.2.1.4.1.1

Factor $y$ out of $- y^{2} \cdot 2$ .

$- y \sqrt{- 3 y^{2} + 40} + 20 + \frac{y (- y \cdot 2) + (y - \sqrt{- 3 y^{2} + 40}) y}{2} - y^{2} = 20$

$x = \frac{y - \sqrt{- 3 y^{2} + 40}}{2}$

Step 3.1.2.1.4.1.2

Factor $y$ out of $(y - \sqrt{- 3 y^{2} + 40}) y$ .

$- y \sqrt{- 3 y^{2} + 40} + 20 + \frac{y (- y \cdot 2) + y (y - \sqrt{- 3 y^{2} + 40})}{2} - y^{2} = 20$

$x = \frac{y - \sqrt{- 3 y^{2} + 40}}{2}$

Step 3.1.2.1.4.1.3

Factor $y$ out of $y (- y \cdot 2) + y (y - \sqrt{- 3 y^{2} + 40})$ .

$- y \sqrt{- 3 y^{2} + 40} + 20 + \frac{y (- y \cdot 2 + y - \sqrt{- 3 y^{2} + 40})}{2} - y^{2} = 20$

$x = \frac{y - \sqrt{- 3 y^{2} + 40}}{2}$

$- y \sqrt{- 3 y^{2} + 40} + 20 + \frac{y (- y \cdot 2 + y - \sqrt{- 3 y^{2} + 40})}{2} - y^{2} = 20$

$x = \frac{y - \sqrt{- 3 y^{2} + 40}}{2}$

Step 3.1.2.1.4.2

Multiply $2$ by $- 1$ .

$- y \sqrt{- 3 y^{2} + 40} + 20 + \frac{y (- 2 y + y - \sqrt{- 3 y^{2} + 40})}{2} - y^{2} = 20$

$x = \frac{y - \sqrt{- 3 y^{2} + 40}}{2}$

Step 3.1.2.1.4.3

Add $- 2 y$ and $y$ .

$- y \sqrt{- 3 y^{2} + 40} + 20 + \frac{y (- y - \sqrt{- 3 y^{2} + 40})}{2} - y^{2} = 20$

$x = \frac{y - \sqrt{- 3 y^{2} + 40}}{2}$

$- y \sqrt{- 3 y^{2} + 40} + 20 + \frac{y (- y - \sqrt{- 3 y^{2} + 40})}{2} - y^{2} = 20$

$x = \frac{y - \sqrt{- 3 y^{2} + 40}}{2}$

Step 3.1.2.1.5

To write $- y \sqrt{- 3 y^{2} + 40}$ as a fraction with a common denominator, multiply by $\frac{2}{2}$ .

$- y \sqrt{- 3 y^{2} + 40} \cdot \frac{2}{2} + \frac{y (- y - \sqrt{- 3 y^{2} + 40})}{2} + 20 - y^{2} = 20$

$x = \frac{y - \sqrt{- 3 y^{2} + 40}}{2}$

Step 3.1.2.1.6

Simplify terms.

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Step 3.1.2.1.6.1

Combine $- y \sqrt{- 3 y^{2} + 40}$ and $\frac{2}{2}$ .

$\frac{- y \sqrt{- 3 y^{2} + 40} \cdot 2}{2} + \frac{y (- y - \sqrt{- 3 y^{2} + 40})}{2} + 20 - y^{2} = 20$

$x = \frac{y - \sqrt{- 3 y^{2} + 40}}{2}$

Step 3.1.2.1.6.2

Combine the numerators over the common denominator.

$\frac{- y \sqrt{- 3 y^{2} + 40} \cdot 2 + y (- y - \sqrt{- 3 y^{2} + 40})}{2} + 20 - y^{2} = 20$

$x = \frac{y - \sqrt{- 3 y^{2} + 40}}{2}$

$\frac{- y \sqrt{- 3 y^{2} + 40} \cdot 2 + y (- y - \sqrt{- 3 y^{2} + 40})}{2} + 20 - y^{2} = 20$

$x = \frac{y - \sqrt{- 3 y^{2} + 40}}{2}$

Step 3.1.2.1.7

Simplify the numerator.

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Step 3.1.2.1.7.1

Factor $y$ out of $- y \sqrt{- 3 y^{2} + 40} \cdot 2 + y (- y - \sqrt{- 3 y^{2} + 40})$ .

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Step 3.1.2.1.7.1.1

Factor $y$ out of $- y \sqrt{- 3 y^{2} + 40} \cdot 2$ .

$\frac{y (- \sqrt{- 3 y^{2} + 40} \cdot 2) + y (- y - \sqrt{- 3 y^{2} + 40})}{2} + 20 - y^{2} = 20$

$x = \frac{y - \sqrt{- 3 y^{2} + 40}}{2}$

Step 3.1.2.1.7.1.2

Factor $y$ out of $y (- \sqrt{- 3 y^{2} + 40} \cdot 2) + y (- y - \sqrt{- 3 y^{2} + 40})$ .

$\frac{y (- \sqrt{- 3 y^{2} + 40} \cdot 2 - y - \sqrt{- 3 y^{2} + 40})}{2} + 20 - y^{2} = 20$

$x = \frac{y - \sqrt{- 3 y^{2} + 40}}{2}$

$\frac{y (- \sqrt{- 3 y^{2} + 40} \cdot 2 - y - \sqrt{- 3 y^{2} + 40})}{2} + 20 - y^{2} = 20$

$x = \frac{y - \sqrt{- 3 y^{2} + 40}}{2}$

Step 3.1.2.1.7.2

Multiply $2$ by $- 1$ .

$\frac{y (- 2 \sqrt{- 3 y^{2} + 40} - y - \sqrt{- 3 y^{2} + 40})}{2} + 20 - y^{2} = 20$

$x = \frac{y - \sqrt{- 3 y^{2} + 40}}{2}$

Step 3.1.2.1.7.3

Subtract $\sqrt{- 3 y^{2} + 40}$ from $- 2 \sqrt{- 3 y^{2} + 40}$ .

$\frac{y (- y - 3 \sqrt{- 3 y^{2} + 40})}{2} + 20 - y^{2} = 20$

$x = \frac{y - \sqrt{- 3 y^{2} + 40}}{2}$

$\frac{y (- y - 3 \sqrt{- 3 y^{2} + 40})}{2} + 20 - y^{2} = 20$

$x = \frac{y - \sqrt{- 3 y^{2} + 40}}{2}$

Step 3.1.2.1.8

To write $20$ as a fraction with a common denominator, multiply by $\frac{2}{2}$ .

$\frac{y (- y - 3 \sqrt{- 3 y^{2} + 40})}{2} + 20 \cdot \frac{2}{2} - y^{2} = 20$

$x = \frac{y - \sqrt{- 3 y^{2} + 40}}{2}$

Step 3.1.2.1.9

Simplify terms.

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Step 3.1.2.1.9.1

Combine $20$ and $\frac{2}{2}$ .

$\frac{y (- y - 3 \sqrt{- 3 y^{2} + 40})}{2} + \frac{20 \cdot 2}{2} - y^{2} = 20$

$x = \frac{y - \sqrt{- 3 y^{2} + 40}}{2}$

Step 3.1.2.1.9.2

Combine the numerators over the common denominator.

$\frac{y (- y - 3 \sqrt{- 3 y^{2} + 40}) + 20 \cdot 2}{2} - y^{2} = 20$

$x = \frac{y - \sqrt{- 3 y^{2} + 40}}{2}$

Step 3.1.2.1.9.3

Multiply $20$ by $2$ .

$\frac{y (- y - 3 \sqrt{- 3 y^{2} + 40}) + 40}{2} - y^{2} = 20$

$x = \frac{y - \sqrt{- 3 y^{2} + 40}}{2}$

$\frac{y (- y - 3 \sqrt{- 3 y^{2} + 40}) + 40}{2} - y^{2} = 20$

$x = \frac{y - \sqrt{- 3 y^{2} + 40}}{2}$

Step 3.1.2.1.10

Simplify the numerator.

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Step 3.1.2.1.10.1

Apply the distributive property.

$\frac{y (- y) + y (- 3 \sqrt{- 3 y^{2} + 40}) + 40}{2} - y^{2} = 20$

$x = \frac{y - \sqrt{- 3 y^{2} + 40}}{2}$

Step 3.1.2.1.10.2

Rewrite using the commutative property of multiplication.

$\frac{- y \cdot y + y (- 3 \sqrt{- 3 y^{2} + 40}) + 40}{2} - y^{2} = 20$

$x = \frac{y - \sqrt{- 3 y^{2} + 40}}{2}$

Step 3.1.2.1.10.3

Rewrite using the commutative property of multiplication.

$\frac{- y \cdot y - 3 y \sqrt{- 3 y^{2} + 40} + 40}{2} - y^{2} = 20$

$x = \frac{y - \sqrt{- 3 y^{2} + 40}}{2}$

Step 3.1.2.1.10.4

Multiply $y$ by $y$ by adding the exponents.

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Step 3.1.2.1.10.4.1

Move $y$ .

$\frac{- (y \cdot y) - 3 y \sqrt{- 3 y^{2} + 40} + 40}{2} - y^{2} = 20$

$x = \frac{y - \sqrt{- 3 y^{2} + 40}}{2}$

Step 3.1.2.1.10.4.2

Multiply $y$ by $y$ .

$\frac{- y^{2} - 3 y \sqrt{- 3 y^{2} + 40} + 40}{2} - y^{2} = 20$

$x = \frac{y - \sqrt{- 3 y^{2} + 40}}{2}$

$\frac{- y^{2} - 3 y \sqrt{- 3 y^{2} + 40} + 40}{2} - y^{2} = 20$

$x = \frac{y - \sqrt{- 3 y^{2} + 40}}{2}$

$\frac{- y^{2} - 3 y \sqrt{- 3 y^{2} + 40} + 40}{2} - y^{2} = 20$

$x = \frac{y - \sqrt{- 3 y^{2} + 40}}{2}$

$\frac{- y^{2} - 3 y \sqrt{- 3 y^{2} + 40} + 40}{2} - y^{2} = 20$

$x = \frac{y - \sqrt{- 3 y^{2} + 40}}{2}$

$\frac{- y^{2} - 3 y \sqrt{- 3 y^{2} + 40} + 40}{2} - y^{2} = 20$

$x = \frac{y - \sqrt{- 3 y^{2} + 40}}{2}$

$\frac{- y^{2} - 3 y \sqrt{- 3 y^{2} + 40} + 40}{2} - y^{2} = 20$

$x = \frac{y - \sqrt{- 3 y^{2} + 40}}{2}$

Step 3.2

Graph each side of the equation. The solution is the x-value of the point of intersection.

$y = - \sqrt{10}, 0$

$x = \frac{y - \sqrt{- 3 y^{2} + 40}}{2}$

Step 3.3

Replace all occurrences of $y$ with $- \sqrt{10}$ in each equation.

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Step 3.3.1

Replace all occurrences of $y$ in $x = \frac{y - \sqrt{- 3 y^{2} + 40}}{2}$ with $- \sqrt{10}$ .

$x = \frac{(- \sqrt{10}) - \sqrt{- 3 {(- \sqrt{10})}^{2} + 40}}{2}$

$y = - \sqrt{10}$

Step 3.3.2

Simplify the right side.

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Step 3.3.2.1

Simplify $\frac{(- \sqrt{10}) - \sqrt{- 3 {(- \sqrt{10})}^{2} + 40}}{2}$ .

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Step 3.3.2.1.1

Simplify the numerator.

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Step 3.3.2.1.1.1

Apply the product rule to $- \sqrt{10}$ .

$x = \frac{- \sqrt{10} - \sqrt{- 3 ({(- 1)}^{2} {\sqrt{10}}^{2}) + 40}}{2}$

$y = - \sqrt{10}$

Step 3.3.2.1.1.2

Raise $- 1$ to the power of $2$ .

$x = \frac{- \sqrt{10} - \sqrt{- 3 (1 {\sqrt{10}}^{2}) + 40}}{2}$

$y = - \sqrt{10}$

Step 3.3.2.1.1.3

Multiply ${\sqrt{10}}^{2}$ by $1$ .

$x = \frac{- \sqrt{10} - \sqrt{- 3 {\sqrt{10}}^{2} + 40}}{2}$

$y = - \sqrt{10}$

Step 3.3.2.1.1.4

Rewrite ${\sqrt{10}}^{2}$ as $10$ .

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Step 3.3.2.1.1.4.1

Use $\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite $\sqrt{10}$ as $10^{\frac{1}{2}}$ .

$x = \frac{- \sqrt{10} - \sqrt{- 3 {(10^{\frac{1}{2}})}^{2} + 40}}{2}$

$y = - \sqrt{10}$

Step 3.3.2.1.1.4.2

Apply the power rule and multiply exponents, ${(a^{m})}^{n} = a^{m n}$ .

$x = \frac{- \sqrt{10} - \sqrt{- 3 \cdot 10^{\frac{1}{2} \cdot 2} + 40}}{2}$

$y = - \sqrt{10}$

Step 3.3.2.1.1.4.3

Combine $\frac{1}{2}$ and $2$ .

$x = \frac{- \sqrt{10} - \sqrt{- 3 \cdot 10^{\frac{2}{2}} + 40}}{2}$

$y = - \sqrt{10}$

Step 3.3.2.1.1.4.4

Cancel the common factor of $2$ .

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Step 3.3.2.1.1.4.4.1

Cancel the common factor.

$x = \frac{- \sqrt{10} - \sqrt{- 3 \cdot 10^{\frac{2}{2}} + 40}}{2}$

$y = - \sqrt{10}$

Step 3.3.2.1.1.4.4.2

Rewrite the expression.

$x = \frac{- \sqrt{10} - \sqrt{- 3 \cdot 10 + 40}}{2}$

$y = - \sqrt{10}$

$x = \frac{- \sqrt{10} - \sqrt{- 3 \cdot 10 + 40}}{2}$

$y = - \sqrt{10}$

Step 3.3.2.1.1.4.5

Evaluate the exponent.

$x = \frac{- \sqrt{10} - \sqrt{- 3 \cdot 10 + 40}}{2}$

$y = - \sqrt{10}$

$x = \frac{- \sqrt{10} - \sqrt{- 3 \cdot 10 + 40}}{2}$

$y = - \sqrt{10}$

Step 3.3.2.1.1.5

Multiply $- 3$ by $10$ .

$x = \frac{- \sqrt{10} - \sqrt{- 30 + 40}}{2}$

$y = - \sqrt{10}$

Step 3.3.2.1.1.6

Add $- 30$ and $40$ .

$x = \frac{- \sqrt{10} - \sqrt{10}}{2}$

$y = - \sqrt{10}$

Step 3.3.2.1.1.7

Subtract $\sqrt{10}$ from $- \sqrt{10}$ .

$x = \frac{- 2 \sqrt{10}}{2}$

$y = - \sqrt{10}$

$x = \frac{- 2 \sqrt{10}}{2}$

$y = - \sqrt{10}$

Step 3.3.2.1.2

Cancel the common factor of $- 2$ and $2$ .

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Step 3.3.2.1.2.1

Factor $2$ out of $- 2 \sqrt{10}$ .

$x = \frac{2 (- \sqrt{10})}{2}$

$y = - \sqrt{10}$

Step 3.3.2.1.2.2

Cancel the common factors.

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Step 3.3.2.1.2.2.1

Factor $2$ out of $2$ .

$x = \frac{2 (- \sqrt{10})}{2 (1)}$

$y = - \sqrt{10}$

Step 3.3.2.1.2.2.2

Cancel the common factor.

$x = \frac{2 (- \sqrt{10})}{2 \cdot 1}$

$y = - \sqrt{10}$

Step 3.3.2.1.2.2.3

Rewrite the expression.

$x = \frac{- \sqrt{10}}{1}$

$y = - \sqrt{10}$

Step 3.3.2.1.2.2.4

Divide $- \sqrt{10}$ by $1$ .

$x = - \sqrt{10}$

$y = - \sqrt{10}$

$x = - \sqrt{10}$

$y = - \sqrt{10}$

$x = - \sqrt{10}$

$y = - \sqrt{10}$

$x = - \sqrt{10}$

$y = - \sqrt{10}$

$x = - \sqrt{10}$

$y = - \sqrt{10}$

$x = - \sqrt{10}$

$y = - \sqrt{10}$

Step 3.4

Replace all occurrences of $y$ with $0$ in each equation.

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Step 3.4.1

Replace all occurrences of $y$ in $x = \frac{y - \sqrt{- 3 y^{2} + 40}}{2}$ with $0$ .

$x = \frac{(0) - \sqrt{- 3 {(0)}^{2} + 40}}{2}$

$y = 0$

Step 3.4.2

Simplify the right side.

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Step 3.4.2.1

Simplify $\frac{(0) - \sqrt{- 3 {(0)}^{2} + 40}}{2}$ .

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Step 3.4.2.1.1

Simplify the numerator.

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Step 3.4.2.1.1.1

Raising $0$ to any positive power yields $0$ .

$x = \frac{0 - \sqrt{- 3 \cdot 0 + 40}}{2}$

$y = 0$

Step 3.4.2.1.1.2

Multiply $- 3$ by $0$ .

$x = \frac{0 - \sqrt{0 + 40}}{2}$

$y = 0$

Step 3.4.2.1.1.3

Add $0$ and $40$ .

$x = \frac{0 - \sqrt{40}}{2}$

$y = 0$

Step 3.4.2.1.1.4

Rewrite $40$ as $2^{2} \cdot 10$ .

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Step 3.4.2.1.1.4.1

Factor $4$ out of $40$ .

$x = \frac{0 - \sqrt{4 (10)}}{2}$

$y = 0$

Step 3.4.2.1.1.4.2

Rewrite $4$ as $2^{2}$ .

$x = \frac{0 - \sqrt{2^{2} \cdot 10}}{2}$

$y = 0$

$x = \frac{0 - \sqrt{2^{2} \cdot 10}}{2}$

$y = 0$

Step 3.4.2.1.1.5

Pull terms out from under the radical.

$x = \frac{0 - (2 \sqrt{10})}{2}$

$y = 0$

Step 3.4.2.1.1.6

Multiply $2$ by $- 1$ .

$x = \frac{0 - 2 \sqrt{10}}{2}$

$y = 0$

Step 3.4.2.1.1.7

Subtract $2 \sqrt{10}$ from $0$ .

$x = \frac{- 2 \sqrt{10}}{2}$

$y = 0$

$x = \frac{- 2 \sqrt{10}}{2}$

$y = 0$

Step 3.4.2.1.2

Cancel the common factor of $- 2$ and $2$ .

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Step 3.4.2.1.2.1

Factor $2$ out of $- 2 \sqrt{10}$ .

$x = \frac{2 (- \sqrt{10})}{2}$

$y = 0$

Step 3.4.2.1.2.2

Cancel the common factors.

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Step 3.4.2.1.2.2.1

Factor $2$ out of $2$ .

$x = \frac{2 (- \sqrt{10})}{2 (1)}$

$y = 0$

Step 3.4.2.1.2.2.2

Cancel the common factor.

$x = \frac{2 (- \sqrt{10})}{2 \cdot 1}$

$y = 0$

Step 3.4.2.1.2.2.3

Rewrite the expression.

$x = \frac{- \sqrt{10}}{1}$

$y = 0$

Step 3.4.2.1.2.2.4

Divide $- \sqrt{10}$ by $1$ .

$x = - \sqrt{10}$

$y = 0$

$x = - \sqrt{10}$

$y = 0$

$x = - \sqrt{10}$

$y = 0$

$x = - \sqrt{10}$

$y = 0$

$x = - \sqrt{10}$

$y = 0$

$x = - \sqrt{10}$

$y = 0$

$x = - \sqrt{10}$

$y = 0$

Step 4

The solution to the system is the complete set of ordered pairs that are valid solutions.

$(\sqrt{10}, 0)$

$(\sqrt{10}, \sqrt{10})$

$(- \sqrt{10}, - \sqrt{10})$

$(- \sqrt{10}, 0)$

Step 5

The result can be shown in multiple forms.

Point Form:

$(\sqrt{10}, 0), (\sqrt{10}, \sqrt{10}), (- \sqrt{10}, - \sqrt{10}), (- \sqrt{10}, 0)$

Equation Form:

$x = \sqrt{10}, y = 0$

$x = \sqrt{10}, y = \sqrt{10}$

$x = - \sqrt{10}, y = - \sqrt{10}$

$x = - \sqrt{10}, y = 0$

Step 6