Calculus Examples

$f (x) = - 3 (5 x^{3} - 2 x + 5) (\sqrt{x} + 2 x)$

Step 1

Differentiate using the Constant Multiple Rule.

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Step 1.1

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

$\frac{d}{d x} [- 3 (5 x^{3} - 2 x + 5) (x^{\frac{1}{2}} + 2 x)]$

Step 1.2

Since $- 3$ is constant with respect to $x$ , the derivative of $- 3 (5 x^{3} - 2 x + 5) (x^{\frac{1}{2}} + 2 x)$ with respect to $x$ is $- 3 \frac{d}{d x} [(5 x^{3} - 2 x + 5) (x^{\frac{1}{2}} + 2 x)]$ .

$- 3 \frac{d}{d x} [(5 x^{3} - 2 x + 5) (x^{\frac{1}{2}} + 2 x)]$

Step 2

Differentiate using the Product Rule which states that $\frac{d}{d x} [f (x) g (x)]$ is $f (x) \frac{d}{d x} [g (x)] + g (x) \frac{d}{d x} [f (x)]$ where $f (x) = 5 x^{3} - 2 x + 5$ and $g (x) = x^{\frac{1}{2}} + 2 x$ .

$- 3 ((5 x^{3} - 2 x + 5) \frac{d}{d x} [x^{\frac{1}{2}} + 2 x] + (x^{\frac{1}{2}} + 2 x) \frac{d}{d x} [5 x^{3} - 2 x + 5])$

Step 3

Differentiate.

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Step 3.1

By the Sum Rule, the derivative of $x^{\frac{1}{2}} + 2 x$ with respect to $x$ is $\frac{d}{d x} [x^{\frac{1}{2}}] + \frac{d}{d x} [2 x]$ .

$- 3 ((5 x^{3} - 2 x + 5) (\frac{d}{d x} [x^{\frac{1}{2}}] + \frac{d}{d x} [2 x]) + (x^{\frac{1}{2}} + 2 x) \frac{d}{d x} [5 x^{3} - 2 x + 5])$

Step 3.2

Differentiate using the Power Rule which states that $\frac{d}{d x} [x^{n}]$ is $n x^{n - 1}$ where $n = \frac{1}{2}$ .

$- 3 ((5 x^{3} - 2 x + 5) (\frac{1}{2} x^{\frac{1}{2} - 1} + \frac{d}{d x} [2 x]) + (x^{\frac{1}{2}} + 2 x) \frac{d}{d x} [5 x^{3} - 2 x + 5])$

Step 4

To write $- 1$ as a fraction with a common denominator, multiply by $\frac{2}{2}$ .

$- 3 ((5 x^{3} - 2 x + 5) (\frac{1}{2} x^{\frac{1}{2} - 1 \cdot \frac{2}{2}} + \frac{d}{d x} [2 x]) + (x^{\frac{1}{2}} + 2 x) \frac{d}{d x} [5 x^{3} - 2 x + 5])$

Step 5

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

$- 3 ((5 x^{3} - 2 x + 5) (\frac{1}{2} x^{\frac{1}{2} + \frac{- 1 \cdot 2}{2}} + \frac{d}{d x} [2 x]) + (x^{\frac{1}{2}} + 2 x) \frac{d}{d x} [5 x^{3} - 2 x + 5])$

Step 6

Combine the numerators over the common denominator.

$- 3 ((5 x^{3} - 2 x + 5) (\frac{1}{2} x^{\frac{1 - 1 \cdot 2}{2}} + \frac{d}{d x} [2 x]) + (x^{\frac{1}{2}} + 2 x) \frac{d}{d x} [5 x^{3} - 2 x + 5])$

Step 7

Simplify the numerator.

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Step 7.1

Multiply $- 1$ by $2$ .

$- 3 ((5 x^{3} - 2 x + 5) (\frac{1}{2} x^{\frac{1 - 2}{2}} + \frac{d}{d x} [2 x]) + (x^{\frac{1}{2}} + 2 x) \frac{d}{d x} [5 x^{3} - 2 x + 5])$

Step 7.2

Subtract $2$ from $1$ .

$- 3 ((5 x^{3} - 2 x + 5) (\frac{1}{2} x^{\frac{- 1}{2}} + \frac{d}{d x} [2 x]) + (x^{\frac{1}{2}} + 2 x) \frac{d}{d x} [5 x^{3} - 2 x + 5])$

Step 8

Combine fractions.

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Step 8.1

Move the negative in front of the fraction.

$- 3 ((5 x^{3} - 2 x + 5) (\frac{1}{2} x^{- \frac{1}{2}} + \frac{d}{d x} [2 x]) + (x^{\frac{1}{2}} + 2 x) \frac{d}{d x} [5 x^{3} - 2 x + 5])$

Step 8.2

Combine $\frac{1}{2}$ and $x^{- \frac{1}{2}}$ .

$- 3 ((5 x^{3} - 2 x + 5) (\frac{x^{- \frac{1}{2}}}{2} + \frac{d}{d x} [2 x]) + (x^{\frac{1}{2}} + 2 x) \frac{d}{d x} [5 x^{3} - 2 x + 5])$

Step 8.3

Move $x^{- \frac{1}{2}}$ to the denominator using the negative exponent rule $b^{- n} = \frac{1}{b^{n}}$ .

$- 3 ((5 x^{3} - 2 x + 5) (\frac{1}{2 x^{\frac{1}{2}}} + \frac{d}{d x} [2 x]) + (x^{\frac{1}{2}} + 2 x) \frac{d}{d x} [5 x^{3} - 2 x + 5])$

Step 9

Since $2$ is constant with respect to $x$ , the derivative of $2 x$ with respect to $x$ is $2 \frac{d}{d x} [x]$ .

$- 3 ((5 x^{3} - 2 x + 5) (\frac{1}{2 x^{\frac{1}{2}}} + 2 \frac{d}{d x} [x]) + (x^{\frac{1}{2}} + 2 x) \frac{d}{d x} [5 x^{3} - 2 x + 5])$

Step 10

Differentiate using the Power Rule which states that $\frac{d}{d x} [x^{n}]$ is $n x^{n - 1}$ where $n = 1$ .

$- 3 ((5 x^{3} - 2 x + 5) (\frac{1}{2 x^{\frac{1}{2}}} + 2 \cdot 1) + (x^{\frac{1}{2}} + 2 x) \frac{d}{d x} [5 x^{3} - 2 x + 5])$

Step 11

Multiply $2$ by $1$ .

$- 3 ((5 x^{3} - 2 x + 5) (\frac{1}{2 x^{\frac{1}{2}}} + 2) + (x^{\frac{1}{2}} + 2 x) \frac{d}{d x} [5 x^{3} - 2 x + 5])$

Step 12

By the Sum Rule, the derivative of $5 x^{3} - 2 x + 5$ with respect to $x$ is $\frac{d}{d x} [5 x^{3}] + \frac{d}{d x} [- 2 x] + \frac{d}{d x} [5]$ .

$- 3 ((5 x^{3} - 2 x + 5) (\frac{1}{2 x^{\frac{1}{2}}} + 2) + (x^{\frac{1}{2}} + 2 x) (\frac{d}{d x} [5 x^{3}] + \frac{d}{d x} [- 2 x] + \frac{d}{d x} [5]))$

Step 13

Since $5$ is constant with respect to $x$ , the derivative of $5 x^{3}$ with respect to $x$ is $5 \frac{d}{d x} [x^{3}]$ .

$- 3 ((5 x^{3} - 2 x + 5) (\frac{1}{2 x^{\frac{1}{2}}} + 2) + (x^{\frac{1}{2}} + 2 x) (5 \frac{d}{d x} [x^{3}] + \frac{d}{d x} [- 2 x] + \frac{d}{d x} [5]))$

Step 14

Differentiate using the Power Rule which states that $\frac{d}{d x} [x^{n}]$ is $n x^{n - 1}$ where $n = 3$ .

$- 3 ((5 x^{3} - 2 x + 5) (\frac{1}{2 x^{\frac{1}{2}}} + 2) + (x^{\frac{1}{2}} + 2 x) (5 (3 x^{2}) + \frac{d}{d x} [- 2 x] + \frac{d}{d x} [5]))$

Step 15

Multiply $3$ by $5$ .

$- 3 ((5 x^{3} - 2 x + 5) (\frac{1}{2 x^{\frac{1}{2}}} + 2) + (x^{\frac{1}{2}} + 2 x) (15 x^{2} + \frac{d}{d x} [- 2 x] + \frac{d}{d x} [5]))$

Step 16

Since $- 2$ is constant with respect to $x$ , the derivative of $- 2 x$ with respect to $x$ is $- 2 \frac{d}{d x} [x]$ .

$- 3 ((5 x^{3} - 2 x + 5) (\frac{1}{2 x^{\frac{1}{2}}} + 2) + (x^{\frac{1}{2}} + 2 x) (15 x^{2} - 2 \frac{d}{d x} [x] + \frac{d}{d x} [5]))$

Step 17

Differentiate using the Power Rule which states that $\frac{d}{d x} [x^{n}]$ is $n x^{n - 1}$ where $n = 1$ .

$- 3 ((5 x^{3} - 2 x + 5) (\frac{1}{2 x^{\frac{1}{2}}} + 2) + (x^{\frac{1}{2}} + 2 x) (15 x^{2} - 2 \cdot 1 + \frac{d}{d x} [5]))$

Step 18

Multiply $- 2$ by $1$ .

$- 3 ((5 x^{3} - 2 x + 5) (\frac{1}{2 x^{\frac{1}{2}}} + 2) + (x^{\frac{1}{2}} + 2 x) (15 x^{2} - 2 + \frac{d}{d x} [5]))$

Step 19

Since $5$ is constant with respect to $x$ , the derivative of $5$ with respect to $x$ is $0$ .

$- 3 ((5 x^{3} - 2 x + 5) (\frac{1}{2 x^{\frac{1}{2}}} + 2) + (x^{\frac{1}{2}} + 2 x) (15 x^{2} - 2 + 0))$

Step 20

Add $15 x^{2} - 2$ and $0$ .

$- 3 ((5 x^{3} - 2 x + 5) (\frac{1}{2 x^{\frac{1}{2}}} + 2) + (x^{\frac{1}{2}} + 2 x) (15 x^{2} - 2))$

Step 21

Simplify.

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Step 21.1

Apply the distributive property.

$- 3 ((5 x^{3} - 2 x + 5) (\frac{1}{2 x^{\frac{1}{2}}} + 2)) - 3 ((x^{\frac{1}{2}} + 2 x) (15 x^{2} - 2))$

Step 21.2

Remove parentheses.

$- 3 (5 x^{3} - 2 x + 5) (\frac{1}{2 x^{\frac{1}{2}}} + 2) - 3 (x^{\frac{1}{2}} + 2 x) (15 x^{2} - 2)$

Step 21.3

Reorder terms.

$- 3 (5 x^{3} - 2 x + 5) (\frac{1}{2 x^{\frac{1}{2}}} + 2) - 3 (15 x^{2} - 2) (x^{\frac{1}{2}} + 2 x)$

Step 21.4

Simplify each term.

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Step 21.4.1

Apply the distributive property.

$(- 3 (5 x^{3}) - 3 (- 2 x) - 3 \cdot 5) (\frac{1}{2 x^{\frac{1}{2}}} + 2) - 3 (15 x^{2} - 2) (x^{\frac{1}{2}} + 2 x)$

Step 21.4.2

Simplify.

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Step 21.4.2.1

Multiply $5$ by $- 3$ .

$(- 15 x^{3} - 3 (- 2 x) - 3 \cdot 5) (\frac{1}{2 x^{\frac{1}{2}}} + 2) - 3 (15 x^{2} - 2) (x^{\frac{1}{2}} + 2 x)$

Step 21.4.2.2

Multiply $- 2$ by $- 3$ .

$(- 15 x^{3} + 6 x - 3 \cdot 5) (\frac{1}{2 x^{\frac{1}{2}}} + 2) - 3 (15 x^{2} - 2) (x^{\frac{1}{2}} + 2 x)$

Step 21.4.2.3

Multiply $- 3$ by $5$ .

$(- 15 x^{3} + 6 x - 15) (\frac{1}{2 x^{\frac{1}{2}}} + 2) - 3 (15 x^{2} - 2) (x^{\frac{1}{2}} + 2 x)$

Step 21.4.3

Expand $(- 15 x^{3} + 6 x - 15) (\frac{1}{2 x^{\frac{1}{2}}} + 2)$ by multiplying each term in the first expression by each term in the second expression.

$- 15 x^{3} \frac{1}{2 x^{\frac{1}{2}}} - 15 x^{3} \cdot 2 + 6 x \frac{1}{2 x^{\frac{1}{2}}} + 6 x \cdot 2 - 15 \frac{1}{2 x^{\frac{1}{2}}} - 15 \cdot 2 - 3 (15 x^{2} - 2) (x^{\frac{1}{2}} + 2 x)$

Step 21.4.4

Simplify each term.

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Step 21.4.4.1

Cancel the common factor of $x^{\frac{1}{2}}$ .

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Step 21.4.4.1.1

Factor $x^{\frac{1}{2}}$ out of $- 15 x^{3}$ .

$x^{\frac{1}{2}} (- 15 x^{\frac{5}{2}}) \frac{1}{2 x^{\frac{1}{2}}} - 15 x^{3} \cdot 2 + 6 x \frac{1}{2 x^{\frac{1}{2}}} + 6 x \cdot 2 - 15 \frac{1}{2 x^{\frac{1}{2}}} - 15 \cdot 2 - 3 (15 x^{2} - 2) (x^{\frac{1}{2}} + 2 x)$

Step 21.4.4.1.2

Factor $x^{\frac{1}{2}}$ out of $2 x^{\frac{1}{2}}$ .

$x^{\frac{1}{2}} (- 15 x^{\frac{5}{2}}) \frac{1}{x^{\frac{1}{2}} \cdot 2} - 15 x^{3} \cdot 2 + 6 x \frac{1}{2 x^{\frac{1}{2}}} + 6 x \cdot 2 - 15 \frac{1}{2 x^{\frac{1}{2}}} - 15 \cdot 2 - 3 (15 x^{2} - 2) (x^{\frac{1}{2}} + 2 x)$

Step 21.4.4.1.3

Cancel the common factor.

Step 21.4.4.1.4

Rewrite the expression.

$- 15 x^{\frac{5}{2}} \frac{1}{2} - 15 x^{3} \cdot 2 + 6 x \frac{1}{2 x^{\frac{1}{2}}} + 6 x \cdot 2 - 15 \frac{1}{2 x^{\frac{1}{2}}} - 15 \cdot 2 - 3 (15 x^{2} - 2) (x^{\frac{1}{2}} + 2 x)$

Step 21.4.4.2

Combine $- 15$ and $\frac{1}{2}$ .

$x^{\frac{5}{2}} \frac{- 15}{2} - 15 x^{3} \cdot 2 + 6 x \frac{1}{2 x^{\frac{1}{2}}} + 6 x \cdot 2 - 15 \frac{1}{2 x^{\frac{1}{2}}} - 15 \cdot 2 - 3 (15 x^{2} - 2) (x^{\frac{1}{2}} + 2 x)$

Step 21.4.4.3

Combine $x^{\frac{5}{2}}$ and $\frac{- 15}{2}$ .

$\frac{x^{\frac{5}{2}} \cdot - 15}{2} - 15 x^{3} \cdot 2 + 6 x \frac{1}{2 x^{\frac{1}{2}}} + 6 x \cdot 2 - 15 \frac{1}{2 x^{\frac{1}{2}}} - 15 \cdot 2 - 3 (15 x^{2} - 2) (x^{\frac{1}{2}} + 2 x)$

Step 21.4.4.4

Move $- 15$ to the left of $x^{\frac{5}{2}}$ .

$\frac{- 15 \cdot x^{\frac{5}{2}}}{2} - 15 x^{3} \cdot 2 + 6 x \frac{1}{2 x^{\frac{1}{2}}} + 6 x \cdot 2 - 15 \frac{1}{2 x^{\frac{1}{2}}} - 15 \cdot 2 - 3 (15 x^{2} - 2) (x^{\frac{1}{2}} + 2 x)$

Step 21.4.4.5

Move the negative in front of the fraction.

$- \frac{15 \cdot x^{\frac{5}{2}}}{2} - 15 x^{3} \cdot 2 + 6 x \frac{1}{2 x^{\frac{1}{2}}} + 6 x \cdot 2 - 15 \frac{1}{2 x^{\frac{1}{2}}} - 15 \cdot 2 - 3 (15 x^{2} - 2) (x^{\frac{1}{2}} + 2 x)$

Step 21.4.4.6

Multiply $2$ by $- 15$ .

$- \frac{15 x^{\frac{5}{2}}}{2} - 30 x^{3} + 6 x \frac{1}{2 x^{\frac{1}{2}}} + 6 x \cdot 2 - 15 \frac{1}{2 x^{\frac{1}{2}}} - 15 \cdot 2 - 3 (15 x^{2} - 2) (x^{\frac{1}{2}} + 2 x)$

Step 21.4.4.7

Cancel the common factor of $2$ .

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Step 21.4.4.7.1

Factor $2$ out of $6 x$ .

$- \frac{15 x^{\frac{5}{2}}}{2} - 30 x^{3} + 2 (3 x) \frac{1}{2 x^{\frac{1}{2}}} + 6 x \cdot 2 - 15 \frac{1}{2 x^{\frac{1}{2}}} - 15 \cdot 2 - 3 (15 x^{2} - 2) (x^{\frac{1}{2}} + 2 x)$

Step 21.4.4.7.2

Factor $2$ out of $2 x^{\frac{1}{2}}$ .

$- \frac{15 x^{\frac{5}{2}}}{2} - 30 x^{3} + 2 (3 x) \frac{1}{2 (x^{\frac{1}{2}})} + 6 x \cdot 2 - 15 \frac{1}{2 x^{\frac{1}{2}}} - 15 \cdot 2 - 3 (15 x^{2} - 2) (x^{\frac{1}{2}} + 2 x)$

Step 21.4.4.7.3

Cancel the common factor.

$- \frac{15 x^{\frac{5}{2}}}{2} - 30 x^{3} + 2 (3 x) \frac{1}{2 x^{\frac{1}{2}}} + 6 x \cdot 2 - 15 \frac{1}{2 x^{\frac{1}{2}}} - 15 \cdot 2 - 3 (15 x^{2} - 2) (x^{\frac{1}{2}} + 2 x)$

Step 21.4.4.7.4

Rewrite the expression.

$- \frac{15 x^{\frac{5}{2}}}{2} - 30 x^{3} + 3 x \frac{1}{x^{\frac{1}{2}}} + 6 x \cdot 2 - 15 \frac{1}{2 x^{\frac{1}{2}}} - 15 \cdot 2 - 3 (15 x^{2} - 2) (x^{\frac{1}{2}} + 2 x)$

Step 21.4.4.8

Combine $3$ and $\frac{1}{x^{\frac{1}{2}}}$ .

$- \frac{15 x^{\frac{5}{2}}}{2} - 30 x^{3} + x \frac{3}{x^{\frac{1}{2}}} + 6 x \cdot 2 - 15 \frac{1}{2 x^{\frac{1}{2}}} - 15 \cdot 2 - 3 (15 x^{2} - 2) (x^{\frac{1}{2}} + 2 x)$

Step 21.4.4.9

Combine $x$ and $\frac{3}{x^{\frac{1}{2}}}$ .

$- \frac{15 x^{\frac{5}{2}}}{2} - 30 x^{3} + \frac{x \cdot 3}{x^{\frac{1}{2}}} + 6 x \cdot 2 - 15 \frac{1}{2 x^{\frac{1}{2}}} - 15 \cdot 2 - 3 (15 x^{2} - 2) (x^{\frac{1}{2}} + 2 x)$

Step 21.4.4.10

Move $x^{\frac{1}{2}}$ to the numerator using the negative exponent rule $\frac{1}{b^{n}} = b^{- n}$ .

$- \frac{15 x^{\frac{5}{2}}}{2} - 30 x^{3} + x \cdot 3 x^{- \frac{1}{2}} + 6 x \cdot 2 - 15 \frac{1}{2 x^{\frac{1}{2}}} - 15 \cdot 2 - 3 (15 x^{2} - 2) (x^{\frac{1}{2}} + 2 x)$

Step 21.4.4.11

Multiply $x$ by $x^{- \frac{1}{2}}$ by adding the exponents.

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Step 21.4.4.11.1

Move $x^{- \frac{1}{2}}$ .

$- \frac{15 x^{\frac{5}{2}}}{2} - 30 x^{3} + x^{- \frac{1}{2}} x \cdot 3 + 6 x \cdot 2 - 15 \frac{1}{2 x^{\frac{1}{2}}} - 15 \cdot 2 - 3 (15 x^{2} - 2) (x^{\frac{1}{2}} + 2 x)$

Step 21.4.4.11.2

Multiply $x^{- \frac{1}{2}}$ by $x$ .

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Step 21.4.4.11.2.1

Raise $x$ to the power of $1$ .

$- \frac{15 x^{\frac{5}{2}}}{2} - 30 x^{3} + x^{- \frac{1}{2}} x^{1} \cdot 3 + 6 x \cdot 2 - 15 \frac{1}{2 x^{\frac{1}{2}}} - 15 \cdot 2 - 3 (15 x^{2} - 2) (x^{\frac{1}{2}} + 2 x)$

Step 21.4.4.11.2.2

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

$- \frac{15 x^{\frac{5}{2}}}{2} - 30 x^{3} + x^{- \frac{1}{2} + 1} \cdot 3 + 6 x \cdot 2 - 15 \frac{1}{2 x^{\frac{1}{2}}} - 15 \cdot 2 - 3 (15 x^{2} - 2) (x^{\frac{1}{2}} + 2 x)$

Step 21.4.4.11.3

Write $1$ as a fraction with a common denominator.

$- \frac{15 x^{\frac{5}{2}}}{2} - 30 x^{3} + x^{- \frac{1}{2} + \frac{2}{2}} \cdot 3 + 6 x \cdot 2 - 15 \frac{1}{2 x^{\frac{1}{2}}} - 15 \cdot 2 - 3 (15 x^{2} - 2) (x^{\frac{1}{2}} + 2 x)$

Step 21.4.4.11.4

Combine the numerators over the common denominator.

$- \frac{15 x^{\frac{5}{2}}}{2} - 30 x^{3} + x^{\frac{- 1 + 2}{2}} \cdot 3 + 6 x \cdot 2 - 15 \frac{1}{2 x^{\frac{1}{2}}} - 15 \cdot 2 - 3 (15 x^{2} - 2) (x^{\frac{1}{2}} + 2 x)$

Step 21.4.4.11.5

Add $- 1$ and $2$ .

$- \frac{15 x^{\frac{5}{2}}}{2} - 30 x^{3} + x^{\frac{1}{2}} \cdot 3 + 6 x \cdot 2 - 15 \frac{1}{2 x^{\frac{1}{2}}} - 15 \cdot 2 - 3 (15 x^{2} - 2) (x^{\frac{1}{2}} + 2 x)$

Step 21.4.4.12

Move $3$ to the left of $x^{\frac{1}{2}}$ .

$- \frac{15 x^{\frac{5}{2}}}{2} - 30 x^{3} + 3 \cdot x^{\frac{1}{2}} + 6 x \cdot 2 - 15 \frac{1}{2 x^{\frac{1}{2}}} - 15 \cdot 2 - 3 (15 x^{2} - 2) (x^{\frac{1}{2}} + 2 x)$

Step 21.4.4.13

Multiply $2$ by $6$ .

$- \frac{15 x^{\frac{5}{2}}}{2} - 30 x^{3} + 3 x^{\frac{1}{2}} + 12 x - 15 \frac{1}{2 x^{\frac{1}{2}}} - 15 \cdot 2 - 3 (15 x^{2} - 2) (x^{\frac{1}{2}} + 2 x)$

Step 21.4.4.14

Combine $- 15$ and $\frac{1}{2 x^{\frac{1}{2}}}$ .

$- \frac{15 x^{\frac{5}{2}}}{2} - 30 x^{3} + 3 x^{\frac{1}{2}} + 12 x + \frac{- 15}{2 x^{\frac{1}{2}}} - 15 \cdot 2 - 3 (15 x^{2} - 2) (x^{\frac{1}{2}} + 2 x)$

Step 21.4.4.15

Move the negative in front of the fraction.

$- \frac{15 x^{\frac{5}{2}}}{2} - 30 x^{3} + 3 x^{\frac{1}{2}} + 12 x - \frac{15}{2 x^{\frac{1}{2}}} - 15 \cdot 2 - 3 (15 x^{2} - 2) (x^{\frac{1}{2}} + 2 x)$

Step 21.4.4.16

Multiply $- 15$ by $2$ .

$- \frac{15 x^{\frac{5}{2}}}{2} - 30 x^{3} + 3 x^{\frac{1}{2}} + 12 x - \frac{15}{2 x^{\frac{1}{2}}} - 30 - 3 (15 x^{2} - 2) (x^{\frac{1}{2}} + 2 x)$

Step 21.4.5

Apply the distributive property.

$- \frac{15 x^{\frac{5}{2}}}{2} - 30 x^{3} + 3 x^{\frac{1}{2}} + 12 x - \frac{15}{2 x^{\frac{1}{2}}} - 30 + (- 3 (15 x^{2}) - 3 \cdot - 2) (x^{\frac{1}{2}} + 2 x)$

Step 21.4.6

Multiply $15$ by $- 3$ .

$- \frac{15 x^{\frac{5}{2}}}{2} - 30 x^{3} + 3 x^{\frac{1}{2}} + 12 x - \frac{15}{2 x^{\frac{1}{2}}} - 30 + (- 45 x^{2} - 3 \cdot - 2) (x^{\frac{1}{2}} + 2 x)$

Step 21.4.7

Multiply $- 3$ by $- 2$ .

$- \frac{15 x^{\frac{5}{2}}}{2} - 30 x^{3} + 3 x^{\frac{1}{2}} + 12 x - \frac{15}{2 x^{\frac{1}{2}}} - 30 + (- 45 x^{2} + 6) (x^{\frac{1}{2}} + 2 x)$

Step 21.4.8

Expand $(- 45 x^{2} + 6) (x^{\frac{1}{2}} + 2 x)$ using the FOIL Method.

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Step 21.4.8.1

Apply the distributive property.

$- \frac{15 x^{\frac{5}{2}}}{2} - 30 x^{3} + 3 x^{\frac{1}{2}} + 12 x - \frac{15}{2 x^{\frac{1}{2}}} - 30 - 45 x^{2} (x^{\frac{1}{2}} + 2 x) + 6 (x^{\frac{1}{2}} + 2 x)$

Step 21.4.8.2

Apply the distributive property.

$- \frac{15 x^{\frac{5}{2}}}{2} - 30 x^{3} + 3 x^{\frac{1}{2}} + 12 x - \frac{15}{2 x^{\frac{1}{2}}} - 30 - 45 x^{2} x^{\frac{1}{2}} - 45 x^{2} (2 x) + 6 (x^{\frac{1}{2}} + 2 x)$

Step 21.4.8.3

Apply the distributive property.

$- \frac{15 x^{\frac{5}{2}}}{2} - 30 x^{3} + 3 x^{\frac{1}{2}} + 12 x - \frac{15}{2 x^{\frac{1}{2}}} - 30 - 45 x^{2} x^{\frac{1}{2}} - 45 x^{2} (2 x) + 6 x^{\frac{1}{2}} + 6 (2 x)$

Step 21.4.9

Simplify each term.

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Step 21.4.9.1

Multiply $x^{2}$ by $x^{\frac{1}{2}}$ by adding the exponents.

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Step 21.4.9.1.1

Move $x^{\frac{1}{2}}$ .

$- \frac{15 x^{\frac{5}{2}}}{2} - 30 x^{3} + 3 x^{\frac{1}{2}} + 12 x - \frac{15}{2 x^{\frac{1}{2}}} - 30 - 45 (x^{\frac{1}{2}} x^{2}) - 45 x^{2} (2 x) + 6 x^{\frac{1}{2}} + 6 (2 x)$

Step 21.4.9.1.2

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

$- \frac{15 x^{\frac{5}{2}}}{2} - 30 x^{3} + 3 x^{\frac{1}{2}} + 12 x - \frac{15}{2 x^{\frac{1}{2}}} - 30 - 45 x^{\frac{1}{2} + 2} - 45 x^{2} (2 x) + 6 x^{\frac{1}{2}} + 6 (2 x)$

Step 21.4.9.1.3

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

$- \frac{15 x^{\frac{5}{2}}}{2} - 30 x^{3} + 3 x^{\frac{1}{2}} + 12 x - \frac{15}{2 x^{\frac{1}{2}}} - 30 - 45 x^{\frac{1}{2} + 2 \cdot \frac{2}{2}} - 45 x^{2} (2 x) + 6 x^{\frac{1}{2}} + 6 (2 x)$

Step 21.4.9.1.4

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

$- \frac{15 x^{\frac{5}{2}}}{2} - 30 x^{3} + 3 x^{\frac{1}{2}} + 12 x - \frac{15}{2 x^{\frac{1}{2}}} - 30 - 45 x^{\frac{1}{2} + \frac{2 \cdot 2}{2}} - 45 x^{2} (2 x) + 6 x^{\frac{1}{2}} + 6 (2 x)$

Step 21.4.9.1.5

Combine the numerators over the common denominator.

$- \frac{15 x^{\frac{5}{2}}}{2} - 30 x^{3} + 3 x^{\frac{1}{2}} + 12 x - \frac{15}{2 x^{\frac{1}{2}}} - 30 - 45 x^{\frac{1 + 2 \cdot 2}{2}} - 45 x^{2} (2 x) + 6 x^{\frac{1}{2}} + 6 (2 x)$

Step 21.4.9.1.6

Simplify the numerator.

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Step 21.4.9.1.6.1

Multiply $2$ by $2$ .

$- \frac{15 x^{\frac{5}{2}}}{2} - 30 x^{3} + 3 x^{\frac{1}{2}} + 12 x - \frac{15}{2 x^{\frac{1}{2}}} - 30 - 45 x^{\frac{1 + 4}{2}} - 45 x^{2} (2 x) + 6 x^{\frac{1}{2}} + 6 (2 x)$

Step 21.4.9.1.6.2

Add $1$ and $4$ .

$- \frac{15 x^{\frac{5}{2}}}{2} - 30 x^{3} + 3 x^{\frac{1}{2}} + 12 x - \frac{15}{2 x^{\frac{1}{2}}} - 30 - 45 x^{\frac{5}{2}} - 45 x^{2} (2 x) + 6 x^{\frac{1}{2}} + 6 (2 x)$

Step 21.4.9.2

Rewrite using the commutative property of multiplication.

$- \frac{15 x^{\frac{5}{2}}}{2} - 30 x^{3} + 3 x^{\frac{1}{2}} + 12 x - \frac{15}{2 x^{\frac{1}{2}}} - 30 - 45 x^{\frac{5}{2}} - 45 \cdot 2 x^{2} x + 6 x^{\frac{1}{2}} + 6 (2 x)$

Step 21.4.9.3

Multiply $x^{2}$ by $x$ by adding the exponents.

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Step 21.4.9.3.1

Move $x$ .

$- \frac{15 x^{\frac{5}{2}}}{2} - 30 x^{3} + 3 x^{\frac{1}{2}} + 12 x - \frac{15}{2 x^{\frac{1}{2}}} - 30 - 45 x^{\frac{5}{2}} - 45 \cdot 2 (x \cdot x^{2}) + 6 x^{\frac{1}{2}} + 6 (2 x)$

Step 21.4.9.3.2

Multiply $x$ by $x^{2}$ .

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Step 21.4.9.3.2.1

Raise $x$ to the power of $1$ .

$- \frac{15 x^{\frac{5}{2}}}{2} - 30 x^{3} + 3 x^{\frac{1}{2}} + 12 x - \frac{15}{2 x^{\frac{1}{2}}} - 30 - 45 x^{\frac{5}{2}} - 45 \cdot 2 (x^{1} x^{2}) + 6 x^{\frac{1}{2}} + 6 (2 x)$

Step 21.4.9.3.2.2

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

$- \frac{15 x^{\frac{5}{2}}}{2} - 30 x^{3} + 3 x^{\frac{1}{2}} + 12 x - \frac{15}{2 x^{\frac{1}{2}}} - 30 - 45 x^{\frac{5}{2}} - 45 \cdot 2 x^{1 + 2} + 6 x^{\frac{1}{2}} + 6 (2 x)$

Step 21.4.9.3.3

Add $1$ and $2$ .

$- \frac{15 x^{\frac{5}{2}}}{2} - 30 x^{3} + 3 x^{\frac{1}{2}} + 12 x - \frac{15}{2 x^{\frac{1}{2}}} - 30 - 45 x^{\frac{5}{2}} - 45 \cdot 2 x^{3} + 6 x^{\frac{1}{2}} + 6 (2 x)$

Step 21.4.9.4

Multiply $- 45$ by $2$ .

$- \frac{15 x^{\frac{5}{2}}}{2} - 30 x^{3} + 3 x^{\frac{1}{2}} + 12 x - \frac{15}{2 x^{\frac{1}{2}}} - 30 - 45 x^{\frac{5}{2}} - 90 x^{3} + 6 x^{\frac{1}{2}} + 6 (2 x)$

Step 21.4.9.5

Multiply $2$ by $6$ .

$- \frac{15 x^{\frac{5}{2}}}{2} - 30 x^{3} + 3 x^{\frac{1}{2}} + 12 x - \frac{15}{2 x^{\frac{1}{2}}} - 30 - 45 x^{\frac{5}{2}} - 90 x^{3} + 6 x^{\frac{1}{2}} + 12 x$

Step 21.5

To write $- 45 x^{\frac{5}{2}}$ as a fraction with a common denominator, multiply by $\frac{2}{2}$ .

$- 30 x^{3} + 3 x^{\frac{1}{2}} + 12 x - \frac{15}{2 x^{\frac{1}{2}}} - 30 - \frac{15 x^{\frac{5}{2}}}{2} - 45 x^{\frac{5}{2}} \cdot \frac{2}{2} - 90 x^{3} + 6 x^{\frac{1}{2}} + 12 x$

Step 21.6

Combine $- 45 x^{\frac{5}{2}}$ and $\frac{2}{2}$ .

$- 30 x^{3} + 3 x^{\frac{1}{2}} + 12 x - \frac{15}{2 x^{\frac{1}{2}}} - 30 - \frac{15 x^{\frac{5}{2}}}{2} + \frac{- 45 x^{\frac{5}{2}} \cdot 2}{2} - 90 x^{3} + 6 x^{\frac{1}{2}} + 12 x$

Step 21.7

Combine the numerators over the common denominator.

$- 30 x^{3} + 3 x^{\frac{1}{2}} + 12 x - \frac{15}{2 x^{\frac{1}{2}}} - 30 + \frac{- 15 x^{\frac{5}{2}} - 45 x^{\frac{5}{2}} \cdot 2}{2} - 90 x^{3} + 6 x^{\frac{1}{2}} + 12 x$

Step 21.8

Simplify each term.

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Step 21.8.1

Simplify the numerator.

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Step 21.8.1.1

Factor $- 15 x^{\frac{5}{2}}$ out of $- 15 x^{\frac{5}{2}} - 45 x^{\frac{5}{2}} \cdot 2$ .

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Step 21.8.1.1.1

Move $x^{\frac{5}{2}}$ .

$- 30 x^{3} + 3 x^{\frac{1}{2}} + 12 x - \frac{15}{2 x^{\frac{1}{2}}} - 30 + \frac{- 15 x^{\frac{5}{2}} - 45 \cdot 2 x^{\frac{5}{2}}}{2} - 90 x^{3} + 6 x^{\frac{1}{2}} + 12 x$

Step 21.8.1.1.2

Factor $- 15 x^{\frac{5}{2}}$ out of $- 15 x^{\frac{5}{2}}$ .

$- 30 x^{3} + 3 x^{\frac{1}{2}} + 12 x - \frac{15}{2 x^{\frac{1}{2}}} - 30 + \frac{- 15 x^{\frac{5}{2}} (1) - 45 \cdot 2 x^{\frac{5}{2}}}{2} - 90 x^{3} + 6 x^{\frac{1}{2}} + 12 x$

Step 21.8.1.1.3

Factor $- 15 x^{\frac{5}{2}}$ out of $- 45 \cdot 2 x^{\frac{5}{2}}$ .

$- 30 x^{3} + 3 x^{\frac{1}{2}} + 12 x - \frac{15}{2 x^{\frac{1}{2}}} - 30 + \frac{- 15 x^{\frac{5}{2}} (1) - 15 x^{\frac{5}{2}} (3 \cdot 2)}{2} - 90 x^{3} + 6 x^{\frac{1}{2}} + 12 x$

Step 21.8.1.1.4

Factor $- 15 x^{\frac{5}{2}}$ out of $- 15 x^{\frac{5}{2}} (1) - 15 x^{\frac{5}{2}} (3 \cdot 2)$ .

$- 30 x^{3} + 3 x^{\frac{1}{2}} + 12 x - \frac{15}{2 x^{\frac{1}{2}}} - 30 + \frac{- 15 x^{\frac{5}{2}} (1 + 3 \cdot 2)}{2} - 90 x^{3} + 6 x^{\frac{1}{2}} + 12 x$

Step 21.8.1.2

Multiply $3$ by $2$ .

$- 30 x^{3} + 3 x^{\frac{1}{2}} + 12 x - \frac{15}{2 x^{\frac{1}{2}}} - 30 + \frac{- 15 x^{\frac{5}{2}} (1 + 6)}{2} - 90 x^{3} + 6 x^{\frac{1}{2}} + 12 x$

Step 21.8.1.3

Add $1$ and $6$ .

$- 30 x^{3} + 3 x^{\frac{1}{2}} + 12 x - \frac{15}{2 x^{\frac{1}{2}}} - 30 + \frac{- 15 x^{\frac{5}{2}} \cdot 7}{2} - 90 x^{3} + 6 x^{\frac{1}{2}} + 12 x$

Step 21.8.1.4

Multiply $7$ by $- 15$ .

$- 30 x^{3} + 3 x^{\frac{1}{2}} + 12 x - \frac{15}{2 x^{\frac{1}{2}}} - 30 + \frac{- 105 x^{\frac{5}{2}}}{2} - 90 x^{3} + 6 x^{\frac{1}{2}} + 12 x$

Step 21.8.2

Move the negative in front of the fraction.

$- 30 x^{3} + 3 x^{\frac{1}{2}} + 12 x - \frac{15}{2 x^{\frac{1}{2}}} - 30 - \frac{105 x^{\frac{5}{2}}}{2} - 90 x^{3} + 6 x^{\frac{1}{2}} + 12 x$

Step 21.9

Subtract $90 x^{3}$ from $- 30 x^{3}$ .

$- 120 x^{3} + 3 x^{\frac{1}{2}} + 12 x - \frac{15}{2 x^{\frac{1}{2}}} - 30 - \frac{105 x^{\frac{5}{2}}}{2} + 6 x^{\frac{1}{2}} + 12 x$

Step 21.10

Add $3 x^{\frac{1}{2}}$ and $6 x^{\frac{1}{2}}$ .

$- 120 x^{3} + 9 x^{\frac{1}{2}} + 12 x - \frac{15}{2 x^{\frac{1}{2}}} - 30 - \frac{105 x^{\frac{5}{2}}}{2} + 12 x$

Step 21.11

Add $12 x$ and $12 x$ .

$- 120 x^{3} + 9 x^{\frac{1}{2}} + 24 x - \frac{15}{2 x^{\frac{1}{2}}} - 30 - \frac{105 x^{\frac{5}{2}}}{2}$