Calculus Examples

$f (5 - \sqrt{5}) = \frac{1}{3} x^{3} - 5 x^{2} + 20 x$

Step 1

Replace the variable $x$ with $5 - \sqrt{5}$ in the expression.

$f (5 - \sqrt{5}) = \frac{1}{3} \cdot {(5 - \sqrt{5})}^{3} - 5 {(5 - \sqrt{5})}^{2} + 20 (5 - \sqrt{5})$

Step 2

Simplify the result.

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Step 2.1

Simplify each term.

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Step 2.1.1

Use the Binomial Theorem.

$f (5 - \sqrt{5}) = \frac{1}{3} \cdot (5^{3} + 3 \cdot (5^{2} (- \sqrt{5})) + 3 \cdot (5 {(- \sqrt{5})}^{2}) + {(- \sqrt{5})}^{3}) - 5 {(5 - \sqrt{5})}^{2} + 20 (5 - \sqrt{5})$

Step 2.1.2

Simplify each term.

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Step 2.1.2.1

Raise $5$ to the power of $3$ .

$f (5 - \sqrt{5}) = \frac{1}{3} \cdot (125 + 3 \cdot (5^{2} (- \sqrt{5})) + 3 \cdot (5 {(- \sqrt{5})}^{2}) + {(- \sqrt{5})}^{3}) - 5 {(5 - \sqrt{5})}^{2} + 20 (5 - \sqrt{5})$

Step 2.1.2.2

Raise $5$ to the power of $2$ .

$f (5 - \sqrt{5}) = \frac{1}{3} \cdot (125 + 3 \cdot (25 (- \sqrt{5})) + 3 \cdot (5 {(- \sqrt{5})}^{2}) + {(- \sqrt{5})}^{3}) - 5 {(5 - \sqrt{5})}^{2} + 20 (5 - \sqrt{5})$

Step 2.1.2.3

Multiply $3$ by $25$ .

$f (5 - \sqrt{5}) = \frac{1}{3} \cdot (125 + 75 (- \sqrt{5}) + 3 \cdot (5 {(- \sqrt{5})}^{2}) + {(- \sqrt{5})}^{3}) - 5 {(5 - \sqrt{5})}^{2} + 20 (5 - \sqrt{5})$

Step 2.1.2.4

Multiply $- 1$ by $75$ .

$f (5 - \sqrt{5}) = \frac{1}{3} \cdot (125 - 75 \sqrt{5} + 3 \cdot (5 {(- \sqrt{5})}^{2}) + {(- \sqrt{5})}^{3}) - 5 {(5 - \sqrt{5})}^{2} + 20 (5 - \sqrt{5})$

Step 2.1.2.5

Multiply $3$ by $5$ .

$f (5 - \sqrt{5}) = \frac{1}{3} \cdot (125 - 75 \sqrt{5} + 15 {(- \sqrt{5})}^{2} + {(- \sqrt{5})}^{3}) - 5 {(5 - \sqrt{5})}^{2} + 20 (5 - \sqrt{5})$

Step 2.1.2.6

Apply the product rule to $- \sqrt{5}$ .

$f (5 - \sqrt{5}) = \frac{1}{3} \cdot (125 - 75 \sqrt{5} + 15 ({(- 1)}^{2} {\sqrt{5}}^{2}) + {(- \sqrt{5})}^{3}) - 5 {(5 - \sqrt{5})}^{2} + 20 (5 - \sqrt{5})$

Step 2.1.2.7

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

$f (5 - \sqrt{5}) = \frac{1}{3} \cdot (125 - 75 \sqrt{5} + 15 (1 {\sqrt{5}}^{2}) + {(- \sqrt{5})}^{3}) - 5 {(5 - \sqrt{5})}^{2} + 20 (5 - \sqrt{5})$

Step 2.1.2.8

Multiply ${\sqrt{5}}^{2}$ by $1$ .

$f (5 - \sqrt{5}) = \frac{1}{3} \cdot (125 - 75 \sqrt{5} + 15 {\sqrt{5}}^{2} + {(- \sqrt{5})}^{3}) - 5 {(5 - \sqrt{5})}^{2} + 20 (5 - \sqrt{5})$

Step 2.1.2.9

Rewrite ${\sqrt{5}}^{2}$ as $5$ .

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Step 2.1.2.9.1

Use $\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite $\sqrt{5}$ as $5^{\frac{1}{2}}$ .

$f (5 - \sqrt{5}) = \frac{1}{3} \cdot (125 - 75 \sqrt{5} + 15 {(5^{\frac{1}{2}})}^{2} + {(- \sqrt{5})}^{3}) - 5 {(5 - \sqrt{5})}^{2} + 20 (5 - \sqrt{5})$

Step 2.1.2.9.2

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

$f (5 - \sqrt{5}) = \frac{1}{3} \cdot (125 - 75 \sqrt{5} + 15 \cdot 5^{\frac{1}{2} \cdot 2} + {(- \sqrt{5})}^{3}) - 5 {(5 - \sqrt{5})}^{2} + 20 (5 - \sqrt{5})$

Step 2.1.2.9.3

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

$f (5 - \sqrt{5}) = \frac{1}{3} \cdot (125 - 75 \sqrt{5} + 15 \cdot 5^{\frac{2}{2}} + {(- \sqrt{5})}^{3}) - 5 {(5 - \sqrt{5})}^{2} + 20 (5 - \sqrt{5})$

Step 2.1.2.9.4

Cancel the common factor of $2$ .

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Step 2.1.2.9.4.1

Cancel the common factor.

$f (5 - \sqrt{5}) = \frac{1}{3} \cdot (125 - 75 \sqrt{5} + 15 \cdot 5^{\frac{2}{2}} + {(- \sqrt{5})}^{3}) - 5 {(5 - \sqrt{5})}^{2} + 20 (5 - \sqrt{5})$

Step 2.1.2.9.4.2

Rewrite the expression.

$f (5 - \sqrt{5}) = \frac{1}{3} \cdot (125 - 75 \sqrt{5} + 15 \cdot 5 + {(- \sqrt{5})}^{3}) - 5 {(5 - \sqrt{5})}^{2} + 20 (5 - \sqrt{5})$

Step 2.1.2.9.5

Evaluate the exponent.

$f (5 - \sqrt{5}) = \frac{1}{3} \cdot (125 - 75 \sqrt{5} + 15 \cdot 5 + {(- \sqrt{5})}^{3}) - 5 {(5 - \sqrt{5})}^{2} + 20 (5 - \sqrt{5})$

Step 2.1.2.10

Multiply $15$ by $5$ .

$f (5 - \sqrt{5}) = \frac{1}{3} \cdot (125 - 75 \sqrt{5} + 75 + {(- \sqrt{5})}^{3}) - 5 {(5 - \sqrt{5})}^{2} + 20 (5 - \sqrt{5})$

Step 2.1.2.11

Apply the product rule to $- \sqrt{5}$ .

$f (5 - \sqrt{5}) = \frac{1}{3} \cdot (125 - 75 \sqrt{5} + 75 + {(- 1)}^{3} {\sqrt{5}}^{3}) - 5 {(5 - \sqrt{5})}^{2} + 20 (5 - \sqrt{5})$

Step 2.1.2.12

Raise $- 1$ to the power of $3$ .

$f (5 - \sqrt{5}) = \frac{1}{3} \cdot (125 - 75 \sqrt{5} + 75 - {\sqrt{5}}^{3}) - 5 {(5 - \sqrt{5})}^{2} + 20 (5 - \sqrt{5})$

Step 2.1.2.13

Rewrite ${\sqrt{5}}^{3}$ as $\sqrt{5^{3}}$ .

$f (5 - \sqrt{5}) = \frac{1}{3} \cdot (125 - 75 \sqrt{5} + 75 - \sqrt{5^{3}}) - 5 {(5 - \sqrt{5})}^{2} + 20 (5 - \sqrt{5})$

Step 2.1.2.14

Raise $5$ to the power of $3$ .

$f (5 - \sqrt{5}) = \frac{1}{3} \cdot (125 - 75 \sqrt{5} + 75 - \sqrt{125}) - 5 {(5 - \sqrt{5})}^{2} + 20 (5 - \sqrt{5})$

Step 2.1.2.15

Rewrite $125$ as $5^{2} \cdot 5$ .

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Step 2.1.2.15.1

Factor $25$ out of $125$ .

$f (5 - \sqrt{5}) = \frac{1}{3} \cdot (125 - 75 \sqrt{5} + 75 - \sqrt{25 (5)}) - 5 {(5 - \sqrt{5})}^{2} + 20 (5 - \sqrt{5})$

Step 2.1.2.15.2

Rewrite $25$ as $5^{2}$ .

$f (5 - \sqrt{5}) = \frac{1}{3} \cdot (125 - 75 \sqrt{5} + 75 - \sqrt{5^{2} \cdot 5}) - 5 {(5 - \sqrt{5})}^{2} + 20 (5 - \sqrt{5})$

Step 2.1.2.16

Pull terms out from under the radical.

$f (5 - \sqrt{5}) = \frac{1}{3} \cdot (125 - 75 \sqrt{5} + 75 - (5 \sqrt{5})) - 5 {(5 - \sqrt{5})}^{2} + 20 (5 - \sqrt{5})$

Step 2.1.2.17

Multiply $5$ by $- 1$ .

$f (5 - \sqrt{5}) = \frac{1}{3} \cdot (125 - 75 \sqrt{5} + 75 - 5 \sqrt{5}) - 5 {(5 - \sqrt{5})}^{2} + 20 (5 - \sqrt{5})$

Step 2.1.3

Add $125$ and $75$ .

$f (5 - \sqrt{5}) = \frac{1}{3} \cdot (200 - 75 \sqrt{5} - 5 \sqrt{5}) - 5 {(5 - \sqrt{5})}^{2} + 20 (5 - \sqrt{5})$

Step 2.1.4

Subtract $5 \sqrt{5}$ from $- 75 \sqrt{5}$ .

$f (5 - \sqrt{5}) = \frac{1}{3} \cdot (200 - 80 \sqrt{5}) - 5 {(5 - \sqrt{5})}^{2} + 20 (5 - \sqrt{5})$

Step 2.1.5

Apply the distributive property.

$f (5 - \sqrt{5}) = \frac{1}{3} \cdot 200 + \frac{1}{3} \cdot (- 80 \sqrt{5}) - 5 {(5 - \sqrt{5})}^{2} + 20 (5 - \sqrt{5})$

Step 2.1.6

Combine $\frac{1}{3}$ and $200$ .

$f (5 - \sqrt{5}) = \frac{200}{3} + \frac{1}{3} \cdot (- 80 \sqrt{5}) - 5 {(5 - \sqrt{5})}^{2} + 20 (5 - \sqrt{5})$

Step 2.1.7

Multiply $\frac{1}{3} (- 80 \sqrt{5})$ .

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Step 2.1.7.1

Combine $- 80$ and $\frac{1}{3}$ .

$f (5 - \sqrt{5}) = \frac{200}{3} + \frac{- 80}{3} \cdot \sqrt{5} - 5 {(5 - \sqrt{5})}^{2} + 20 (5 - \sqrt{5})$

Step 2.1.7.2

Combine $\frac{- 80}{3}$ and $\sqrt{5}$ .

$f (5 - \sqrt{5}) = \frac{200}{3} + \frac{- 80 \sqrt{5}}{3} - 5 {(5 - \sqrt{5})}^{2} + 20 (5 - \sqrt{5})$

Step 2.1.8

Move the negative in front of the fraction.

$f (5 - \sqrt{5}) = \frac{200}{3} - \frac{80 \sqrt{5}}{3} - 5 {(5 - \sqrt{5})}^{2} + 20 (5 - \sqrt{5})$

Step 2.1.9

Rewrite ${(5 - \sqrt{5})}^{2}$ as $(5 - \sqrt{5}) (5 - \sqrt{5})$ .

$f (5 - \sqrt{5}) = \frac{200}{3} - \frac{80 \sqrt{5}}{3} - 5 ((5 - \sqrt{5}) (5 - \sqrt{5})) + 20 (5 - \sqrt{5})$

Step 2.1.10

Expand $(5 - \sqrt{5}) (5 - \sqrt{5})$ using the FOIL Method.

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Step 2.1.10.1

Apply the distributive property.

$f (5 - \sqrt{5}) = \frac{200}{3} - \frac{80 \sqrt{5}}{3} - 5 (5 (5 - \sqrt{5}) - \sqrt{5} (5 - \sqrt{5})) + 20 (5 - \sqrt{5})$

Step 2.1.10.2

Apply the distributive property.

$f (5 - \sqrt{5}) = \frac{200}{3} - \frac{80 \sqrt{5}}{3} - 5 (5 \cdot 5 + 5 (- \sqrt{5}) - \sqrt{5} (5 - \sqrt{5})) + 20 (5 - \sqrt{5})$

Step 2.1.10.3

Apply the distributive property.

$f (5 - \sqrt{5}) = \frac{200}{3} - \frac{80 \sqrt{5}}{3} - 5 (5 \cdot 5 + 5 (- \sqrt{5}) - \sqrt{5} \cdot 5 - \sqrt{5} (- \sqrt{5})) + 20 (5 - \sqrt{5})$

Step 2.1.11

Simplify and combine like terms.

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Step 2.1.11.1

Simplify each term.

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Step 2.1.11.1.1

Multiply $5$ by $5$ .

$f (5 - \sqrt{5}) = \frac{200}{3} - \frac{80 \sqrt{5}}{3} - 5 (25 + 5 (- \sqrt{5}) - \sqrt{5} \cdot 5 - \sqrt{5} (- \sqrt{5})) + 20 (5 - \sqrt{5})$

Step 2.1.11.1.2

Multiply $- 1$ by $5$ .

$f (5 - \sqrt{5}) = \frac{200}{3} - \frac{80 \sqrt{5}}{3} - 5 (25 - 5 \sqrt{5} - \sqrt{5} \cdot 5 - \sqrt{5} (- \sqrt{5})) + 20 (5 - \sqrt{5})$

Step 2.1.11.1.3

Multiply $5$ by $- 1$ .

$f (5 - \sqrt{5}) = \frac{200}{3} - \frac{80 \sqrt{5}}{3} - 5 (25 - 5 \sqrt{5} - 5 \sqrt{5} - \sqrt{5} (- \sqrt{5})) + 20 (5 - \sqrt{5})$

Step 2.1.11.1.4

Multiply $- \sqrt{5} (- \sqrt{5})$ .

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Step 2.1.11.1.4.1

Multiply $- 1$ by $- 1$ .

$f (5 - \sqrt{5}) = \frac{200}{3} - \frac{80 \sqrt{5}}{3} - 5 (25 - 5 \sqrt{5} - 5 \sqrt{5} + 1 \sqrt{5} \sqrt{5}) + 20 (5 - \sqrt{5})$

Step 2.1.11.1.4.2

Multiply $\sqrt{5}$ by $1$ .

$f (5 - \sqrt{5}) = \frac{200}{3} - \frac{80 \sqrt{5}}{3} - 5 (25 - 5 \sqrt{5} - 5 \sqrt{5} + \sqrt{5} \sqrt{5}) + 20 (5 - \sqrt{5})$

Step 2.1.11.1.4.3

Raise $\sqrt{5}$ to the power of $1$ .

$f (5 - \sqrt{5}) = \frac{200}{3} - \frac{80 \sqrt{5}}{3} - 5 (25 - 5 \sqrt{5} - 5 \sqrt{5} + \sqrt{5} \sqrt{5}) + 20 (5 - \sqrt{5})$

Step 2.1.11.1.4.4

Raise $\sqrt{5}$ to the power of $1$ .

$f (5 - \sqrt{5}) = \frac{200}{3} - \frac{80 \sqrt{5}}{3} - 5 (25 - 5 \sqrt{5} - 5 \sqrt{5} + \sqrt{5} \sqrt{5}) + 20 (5 - \sqrt{5})$

Step 2.1.11.1.4.5

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

$f (5 - \sqrt{5}) = \frac{200}{3} - \frac{80 \sqrt{5}}{3} - 5 (25 - 5 \sqrt{5} - 5 \sqrt{5} + {\sqrt{5}}^{1 + 1}) + 20 (5 - \sqrt{5})$

Step 2.1.11.1.4.6

Add $1$ and $1$ .

$f (5 - \sqrt{5}) = \frac{200}{3} - \frac{80 \sqrt{5}}{3} - 5 (25 - 5 \sqrt{5} - 5 \sqrt{5} + {\sqrt{5}}^{2}) + 20 (5 - \sqrt{5})$

Step 2.1.11.1.5

Rewrite ${\sqrt{5}}^{2}$ as $5$ .

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Step 2.1.11.1.5.1

Use $\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite $\sqrt{5}$ as $5^{\frac{1}{2}}$ .

$f (5 - \sqrt{5}) = \frac{200}{3} - \frac{80 \sqrt{5}}{3} - 5 (25 - 5 \sqrt{5} - 5 \sqrt{5} + {(5^{\frac{1}{2}})}^{2}) + 20 (5 - \sqrt{5})$

Step 2.1.11.1.5.2

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

$f (5 - \sqrt{5}) = \frac{200}{3} - \frac{80 \sqrt{5}}{3} - 5 (25 - 5 \sqrt{5} - 5 \sqrt{5} + 5^{\frac{1}{2} \cdot 2}) + 20 (5 - \sqrt{5})$

Step 2.1.11.1.5.3

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

$f (5 - \sqrt{5}) = \frac{200}{3} - \frac{80 \sqrt{5}}{3} - 5 (25 - 5 \sqrt{5} - 5 \sqrt{5} + 5^{\frac{2}{2}}) + 20 (5 - \sqrt{5})$

Step 2.1.11.1.5.4

Cancel the common factor of $2$ .

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Step 2.1.11.1.5.4.1

Cancel the common factor.

$f (5 - \sqrt{5}) = \frac{200}{3} - \frac{80 \sqrt{5}}{3} - 5 (25 - 5 \sqrt{5} - 5 \sqrt{5} + 5^{\frac{2}{2}}) + 20 (5 - \sqrt{5})$

Step 2.1.11.1.5.4.2

Rewrite the expression.

$f (5 - \sqrt{5}) = \frac{200}{3} - \frac{80 \sqrt{5}}{3} - 5 (25 - 5 \sqrt{5} - 5 \sqrt{5} + 5) + 20 (5 - \sqrt{5})$

Step 2.1.11.1.5.5

Evaluate the exponent.

$f (5 - \sqrt{5}) = \frac{200}{3} - \frac{80 \sqrt{5}}{3} - 5 (25 - 5 \sqrt{5} - 5 \sqrt{5} + 5) + 20 (5 - \sqrt{5})$

Step 2.1.11.2

Add $25$ and $5$ .

$f (5 - \sqrt{5}) = \frac{200}{3} - \frac{80 \sqrt{5}}{3} - 5 (30 - 5 \sqrt{5} - 5 \sqrt{5}) + 20 (5 - \sqrt{5})$

Step 2.1.11.3

Subtract $5 \sqrt{5}$ from $- 5 \sqrt{5}$ .

$f (5 - \sqrt{5}) = \frac{200}{3} - \frac{80 \sqrt{5}}{3} - 5 (30 - 10 \sqrt{5}) + 20 (5 - \sqrt{5})$

Step 2.1.12

Apply the distributive property.

$f (5 - \sqrt{5}) = \frac{200}{3} - \frac{80 \sqrt{5}}{3} - 5 \cdot 30 - 5 (- 10 \sqrt{5}) + 20 (5 - \sqrt{5})$

Step 2.1.13

Multiply $- 5$ by $30$ .

$f (5 - \sqrt{5}) = \frac{200}{3} - \frac{80 \sqrt{5}}{3} - 150 - 5 (- 10 \sqrt{5}) + 20 (5 - \sqrt{5})$

Step 2.1.14

Multiply $- 10$ by $- 5$ .

$f (5 - \sqrt{5}) = \frac{200}{3} - \frac{80 \sqrt{5}}{3} - 150 + 50 \sqrt{5} + 20 (5 - \sqrt{5})$

Step 2.1.15

Apply the distributive property.

$f (5 - \sqrt{5}) = \frac{200}{3} - \frac{80 \sqrt{5}}{3} - 150 + 50 \sqrt{5} + 20 \cdot 5 + 20 (- \sqrt{5})$

Step 2.1.16

Multiply $20$ by $5$ .

$f (5 - \sqrt{5}) = \frac{200}{3} - \frac{80 \sqrt{5}}{3} - 150 + 50 \sqrt{5} + 100 + 20 (- \sqrt{5})$

Step 2.1.17

Multiply $- 1$ by $20$ .

$f (5 - \sqrt{5}) = \frac{200}{3} - \frac{80 \sqrt{5}}{3} - 150 + 50 \sqrt{5} + 100 - 20 \sqrt{5}$

Step 2.2

To write $- 150$ as a fraction with a common denominator, multiply by $\frac{3}{3}$ .

$f (5 - \sqrt{5}) = \frac{200}{3} - 150 \cdot \frac{3}{3} - \frac{80 \sqrt{5}}{3} + 50 \sqrt{5} + 100 - 20 \sqrt{5}$

Step 2.3

Combine $- 150$ and $\frac{3}{3}$ .

$f (5 - \sqrt{5}) = \frac{200}{3} + \frac{- 150 \cdot 3}{3} - \frac{80 \sqrt{5}}{3} + 50 \sqrt{5} + 100 - 20 \sqrt{5}$

Step 2.4

Combine the numerators over the common denominator.

$f (5 - \sqrt{5}) = \frac{200 - 150 \cdot 3}{3} - \frac{80 \sqrt{5}}{3} + 50 \sqrt{5} + 100 - 20 \sqrt{5}$

Step 2.5

Simplify the numerator.

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Step 2.5.1

Multiply $- 150$ by $3$ .

$f (5 - \sqrt{5}) = \frac{200 - 450}{3} - \frac{80 \sqrt{5}}{3} + 50 \sqrt{5} + 100 - 20 \sqrt{5}$

Step 2.5.2

Subtract $450$ from $200$ .

$f (5 - \sqrt{5}) = \frac{- 250}{3} - \frac{80 \sqrt{5}}{3} + 50 \sqrt{5} + 100 - 20 \sqrt{5}$

Step 2.6

Move the negative in front of the fraction.

$f (5 - \sqrt{5}) = - \frac{250}{3} - \frac{80 \sqrt{5}}{3} + 50 \sqrt{5} + 100 - 20 \sqrt{5}$

Step 2.7

To write $100$ as a fraction with a common denominator, multiply by $\frac{3}{3}$ .

$f (5 - \sqrt{5}) = - \frac{250}{3} + 100 \cdot \frac{3}{3} - \frac{80 \sqrt{5}}{3} + 50 \sqrt{5} - 20 \sqrt{5}$

Step 2.8

Combine $100$ and $\frac{3}{3}$ .

$f (5 - \sqrt{5}) = - \frac{250}{3} + \frac{100 \cdot 3}{3} - \frac{80 \sqrt{5}}{3} + 50 \sqrt{5} - 20 \sqrt{5}$

Step 2.9

Combine the numerators over the common denominator.

$f (5 - \sqrt{5}) = \frac{- 250 + 100 \cdot 3}{3} - \frac{80 \sqrt{5}}{3} + 50 \sqrt{5} - 20 \sqrt{5}$

Step 2.10

Simplify the numerator.

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Step 2.10.1

Multiply $100$ by $3$ .

$f (5 - \sqrt{5}) = \frac{- 250 + 300}{3} - \frac{80 \sqrt{5}}{3} + 50 \sqrt{5} - 20 \sqrt{5}$

Step 2.10.2

Add $- 250$ and $300$ .

$f (5 - \sqrt{5}) = \frac{50}{3} - \frac{80 \sqrt{5}}{3} + 50 \sqrt{5} - 20 \sqrt{5}$

Step 2.11

To write $50 \sqrt{5}$ as a fraction with a common denominator, multiply by $\frac{3}{3}$ .

$f (5 - \sqrt{5}) = \frac{50}{3} - \frac{80 \sqrt{5}}{3} + 50 \sqrt{5} \cdot \frac{3}{3} - 20 \sqrt{5}$

Step 2.12

Combine $50 \sqrt{5}$ and $\frac{3}{3}$ .

$f (5 - \sqrt{5}) = \frac{50}{3} - \frac{80 \sqrt{5}}{3} + \frac{50 \sqrt{5} \cdot 3}{3} - 20 \sqrt{5}$

Step 2.13

Combine the numerators over the common denominator.

$f (5 - \sqrt{5}) = \frac{50}{3} + \frac{- 80 \sqrt{5} + 50 \sqrt{5} \cdot 3}{3} - 20 \sqrt{5}$

Step 2.14

Combine the numerators over the common denominator.

$f (5 - \sqrt{5}) = - 20 \sqrt{5} + \frac{50 - 80 \sqrt{5} + 50 \sqrt{5} \cdot 3}{3}$

Step 2.15

Multiply $3$ by $50$ .

$f (5 - \sqrt{5}) = - 20 \sqrt{5} + \frac{50 - 80 \sqrt{5} + 150 \sqrt{5}}{3}$

Step 2.16

Add $- 80 \sqrt{5}$ and $150 \sqrt{5}$ .

$f (5 - \sqrt{5}) = - 20 \sqrt{5} + \frac{50 + 70 \sqrt{5}}{3}$

Step 2.17

To write $- 20 \sqrt{5}$ as a fraction with a common denominator, multiply by $\frac{3}{3}$ .

$f (5 - \sqrt{5}) = - 20 \sqrt{5} \cdot \frac{3}{3} + \frac{50 + 70 \sqrt{5}}{3}$

Step 2.18

Combine fractions.

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Step 2.18.1

Combine $- 20 \sqrt{5}$ and $\frac{3}{3}$ .

$f (5 - \sqrt{5}) = \frac{- 20 \sqrt{5} \cdot 3}{3} + \frac{50 + 70 \sqrt{5}}{3}$

Step 2.18.2

Combine the numerators over the common denominator.

$f (5 - \sqrt{5}) = \frac{- 20 \sqrt{5} \cdot 3 + 50 + 70 \sqrt{5}}{3}$

Step 2.19

Simplify the numerator.

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Step 2.19.1

Multiply $3$ by $- 20$ .

$f (5 - \sqrt{5}) = \frac{- 60 \sqrt{5} + 50 + 70 \sqrt{5}}{3}$

Step 2.19.2

Add $- 60 \sqrt{5}$ and $70 \sqrt{5}$ .

$f (5 - \sqrt{5}) = \frac{50 + 10 \sqrt{5}}{3}$

Step 2.20

The final answer is $\frac{50 + 10 \sqrt{5}}{3}$ .

$\frac{50 + 10 \sqrt{5}}{3}$

Step 3

The result can be shown in multiple forms.

Exact Form:

$\frac{50 + 10 \sqrt{5}}{3}$

Decimal Form:

$24.12022659 \dots$

Step 4