Algebra Examples

$f (x) = \frac{3 x + 1}{x^{2} - 25}$ , $y (x) = \frac{2 x - 4}{x^{2} - 25}$

Step 1

Set up the composite result function.

$y (f (x))$

Step 2

Evaluate $y (\frac{3 x + 1}{x^{2} - 25})$ by substituting in the value of $f$ into $y$ .

$y (\frac{3 x + 1}{x^{2} - 25}) = \frac{2 (\frac{3 x + 1}{x^{2} - 25}) - 4}{{(\frac{3 x + 1}{x^{2} - 25})}^{2} - 25}$

Step 3

Simplify the denominator.

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Step 3.1

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

$y (\frac{3 x + 1}{x^{2} - 25}) = \frac{2 (\frac{3 x + 1}{x^{2} - 5^{2}}) - 4}{{(\frac{3 x + 1}{x^{2} - 25})}^{2} - 25}$

Step 3.2

Since both terms are perfect squares, factor using the difference of squares formula, $a^{2} - b^{2} = (a + b) (a - b)$ where $a = x$ and $b = 5$ .

$y (\frac{3 x + 1}{x^{2} - 25}) = \frac{2 (\frac{3 x + 1}{(x + 5) (x - 5)}) - 4}{{(\frac{3 x + 1}{x^{2} - 25})}^{2} - 25}$

Step 4

Simplify the denominator.

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Step 4.1

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

$y (\frac{3 x + 1}{x^{2} - 25}) = \frac{2 (\frac{3 x + 1}{(x + 5) (x - 5)}) - 4}{{(\frac{3 x + 1}{x^{2} - 5^{2}})}^{2} - 25}$

Step 4.2

Since both terms are perfect squares, factor using the difference of squares formula, $a^{2} - b^{2} = (a + b) (a - b)$ where $a = x$ and $b = 5$ .

$y (\frac{3 x + 1}{x^{2} - 25}) = \frac{2 (\frac{3 x + 1}{(x + 5) (x - 5)}) - 4}{{(\frac{3 x + 1}{(x + 5) (x - 5)})}^{2} - 25}$

Step 5

Simplify the numerator.

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Step 5.1

Factor $2$ out of $2 \frac{3 x + 1}{(x + 5) (x - 5)} - 4$ .

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Step 5.1.1

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

$y (\frac{3 x + 1}{x^{2} - 25}) = \frac{2 (\frac{3 x + 1}{(x + 5) (x - 5)}) - 4}{{(\frac{3 x + 1}{(x + 5) (x - 5)})}^{2} - 25}$

Step 5.1.2

Factor $2$ out of $- 4$ .

$y (\frac{3 x + 1}{x^{2} - 25}) = \frac{2 (\frac{3 x + 1}{(x + 5) (x - 5)}) + 2 \cdot - 2}{{(\frac{3 x + 1}{(x + 5) (x - 5)})}^{2} - 25}$

Step 5.1.3

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

$y (\frac{3 x + 1}{x^{2} - 25}) = \frac{2 (\frac{3 x + 1}{(x + 5) (x - 5)} - 2)}{{(\frac{3 x + 1}{(x + 5) (x - 5)})}^{2} - 25}$

Step 5.2

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

$y (\frac{3 x + 1}{x^{2} - 25}) = \frac{2 (\frac{3 x + 1}{(x + 5) (x - 5)} - 2 \cdot \frac{(x + 5) (x - 5)}{(x + 5) (x - 5)})}{{(\frac{3 x + 1}{(x + 5) (x - 5)})}^{2} - 25}$

Step 5.3

Combine $- 2$ and $\frac{(x + 5) (x - 5)}{(x + 5) (x - 5)}$ .

$y (\frac{3 x + 1}{x^{2} - 25}) = \frac{2 (\frac{3 x + 1}{(x + 5) (x - 5)} + \frac{- 2 ((x + 5) (x - 5))}{(x + 5) (x - 5)})}{{(\frac{3 x + 1}{(x + 5) (x - 5)})}^{2} - 25}$

Step 5.4

Combine the numerators over the common denominator.

$y (\frac{3 x + 1}{x^{2} - 25}) = \frac{2 (\frac{3 x + 1 - 2 ((x + 5) (x - 5))}{(x + 5) (x - 5)})}{{(\frac{3 x + 1}{(x + 5) (x - 5)})}^{2} - 25}$

Step 5.5

Rewrite $\frac{3 x + 1 - 2 ((x + 5) (x - 5))}{(x + 5) (x - 5)}$ in a factored form.

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Step 5.5.1

Expand $(x + 5) (x - 5)$ using the FOIL Method.

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Step 5.5.1.1

Apply the distributive property.

$y (\frac{3 x + 1}{x^{2} - 25}) = \frac{2 (\frac{3 x + 1 - 2 (x (x - 5) + 5 (x - 5))}{(x + 5) (x - 5)})}{{(\frac{3 x + 1}{(x + 5) (x - 5)})}^{2} - 25}$

Step 5.5.1.2

Apply the distributive property.

$y (\frac{3 x + 1}{x^{2} - 25}) = \frac{2 (\frac{3 x + 1 - 2 (x \cdot x + x \cdot - 5 + 5 (x - 5))}{(x + 5) (x - 5)})}{{(\frac{3 x + 1}{(x + 5) (x - 5)})}^{2} - 25}$

Step 5.5.1.3

Apply the distributive property.

$y (\frac{3 x + 1}{x^{2} - 25}) = \frac{2 (\frac{3 x + 1 - 2 (x \cdot x + x \cdot - 5 + 5 x + 5 \cdot - 5)}{(x + 5) (x - 5)})}{{(\frac{3 x + 1}{(x + 5) (x - 5)})}^{2} - 25}$

Step 5.5.2

Combine the opposite terms in $x \cdot x + x \cdot - 5 + 5 x + 5 \cdot - 5$ .

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Step 5.5.2.1

Reorder the factors in the terms $x \cdot - 5$ and $5 x$ .

$y (\frac{3 x + 1}{x^{2} - 25}) = \frac{2 (\frac{3 x + 1 - 2 (x \cdot x - 5 x + 5 x + 5 \cdot - 5)}{(x + 5) (x - 5)})}{{(\frac{3 x + 1}{(x + 5) (x - 5)})}^{2} - 25}$

Step 5.5.2.2

Add $- 5 x$ and $5 x$ .

$y (\frac{3 x + 1}{x^{2} - 25}) = \frac{2 (\frac{3 x + 1 - 2 (x \cdot x + 0 + 5 \cdot - 5)}{(x + 5) (x - 5)})}{{(\frac{3 x + 1}{(x + 5) (x - 5)})}^{2} - 25}$

Step 5.5.2.3

Add $x \cdot x$ and $0$ .

$y (\frac{3 x + 1}{x^{2} - 25}) = \frac{2 (\frac{3 x + 1 - 2 (x \cdot x + 5 \cdot - 5)}{(x + 5) (x - 5)})}{{(\frac{3 x + 1}{(x + 5) (x - 5)})}^{2} - 25}$

Step 5.5.3

Simplify each term.

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Step 5.5.3.1

Multiply $x$ by $x$ .

$y (\frac{3 x + 1}{x^{2} - 25}) = \frac{2 (\frac{3 x + 1 - 2 (x^{2} + 5 \cdot - 5)}{(x + 5) (x - 5)})}{{(\frac{3 x + 1}{(x + 5) (x - 5)})}^{2} - 25}$

Step 5.5.3.2

Multiply $5$ by $- 5$ .

$y (\frac{3 x + 1}{x^{2} - 25}) = \frac{2 (\frac{3 x + 1 - 2 (x^{2} - 25)}{(x + 5) (x - 5)})}{{(\frac{3 x + 1}{(x + 5) (x - 5)})}^{2} - 25}$

Step 5.5.4

Apply the distributive property.

$y (\frac{3 x + 1}{x^{2} - 25}) = \frac{2 (\frac{3 x + 1 - 2 x^{2} - 2 \cdot - 25}{(x + 5) (x - 5)})}{{(\frac{3 x + 1}{(x + 5) (x - 5)})}^{2} - 25}$

Step 5.5.5

Multiply $- 2$ by $- 25$ .

$y (\frac{3 x + 1}{x^{2} - 25}) = \frac{2 (\frac{3 x + 1 - 2 x^{2} + 50}{(x + 5) (x - 5)})}{{(\frac{3 x + 1}{(x + 5) (x - 5)})}^{2} - 25}$

Step 5.5.6

Add $1$ and $50$ .

$y (\frac{3 x + 1}{x^{2} - 25}) = \frac{2 (\frac{3 x - 2 x^{2} + 51}{(x + 5) (x - 5)})}{{(\frac{3 x + 1}{(x + 5) (x - 5)})}^{2} - 25}$

Step 5.5.7

Reorder terms.

$y (\frac{3 x + 1}{x^{2} - 25}) = \frac{2 (\frac{- 2 x^{2} + 3 x + 51}{(x + 5) (x - 5)})}{{(\frac{3 x + 1}{(x + 5) (x - 5)})}^{2} - 25}$

Step 6

Simplify the denominator.

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Step 6.1

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

$y (\frac{3 x + 1}{x^{2} - 25}) = \frac{2 (\frac{- 2 x^{2} + 3 x + 51}{(x + 5) (x - 5)})}{{(\frac{3 x + 1}{(x + 5) (x - 5)})}^{2} - 5^{2}}$

Step 6.2

Since both terms are perfect squares, factor using the difference of squares formula, $a^{2} - b^{2} = (a + b) (a - b)$ where $a = \frac{3 x + 1}{(x + 5) (x - 5)}$ and $b = 5$ .

$y (\frac{3 x + 1}{x^{2} - 25}) = \frac{2 (\frac{- 2 x^{2} + 3 x + 51}{(x + 5) (x - 5)})}{(\frac{3 x + 1}{(x + 5) (x - 5)} + 5) (\frac{3 x + 1}{(x + 5) (x - 5)} - 5)}$

Step 6.3

Simplify.

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Step 6.3.1

To write $5$ as a fraction with a common denominator, multiply by $\frac{(x + 5) (x - 5)}{(x + 5) (x - 5)}$ .

$y (\frac{3 x + 1}{x^{2} - 25}) = \frac{2 (\frac{- 2 x^{2} + 3 x + 51}{(x + 5) (x - 5)})}{(\frac{3 x + 1}{(x + 5) (x - 5)} + 5 \cdot \frac{(x + 5) (x - 5)}{(x + 5) (x - 5)}) (\frac{3 x + 1}{(x + 5) (x - 5)} - 5)}$

Step 6.3.2

Combine $5$ and $\frac{(x + 5) (x - 5)}{(x + 5) (x - 5)}$ .

$y (\frac{3 x + 1}{x^{2} - 25}) = \frac{2 (\frac{- 2 x^{2} + 3 x + 51}{(x + 5) (x - 5)})}{(\frac{3 x + 1}{(x + 5) (x - 5)} + \frac{5 ((x + 5) (x - 5))}{(x + 5) (x - 5)}) (\frac{3 x + 1}{(x + 5) (x - 5)} - 5)}$

Step 6.3.3

Combine the numerators over the common denominator.

$y (\frac{3 x + 1}{x^{2} - 25}) = \frac{2 (\frac{- 2 x^{2} + 3 x + 51}{(x + 5) (x - 5)})}{\frac{3 x + 1 + 5 ((x + 5) (x - 5))}{(x + 5) (x - 5)} \cdot (\frac{3 x + 1}{(x + 5) (x - 5)} - 5)}$

Step 6.3.4

Reorder terms.

$y (\frac{3 x + 1}{x^{2} - 25}) = \frac{2 (\frac{- 2 x^{2} + 3 x + 51}{(x + 5) (x - 5)})}{\frac{5 (x + 5) (x - 5) + 3 x + 1}{(x + 5) (x - 5)} \cdot (\frac{3 x + 1}{(x + 5) (x - 5)} - 5)}$

Step 6.3.5

Rewrite $\frac{5 (x + 5) (x - 5) + 3 x + 1}{(x + 5) (x - 5)}$ in a factored form.

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Step 6.3.5.1

Apply the distributive property.

$y (\frac{3 x + 1}{x^{2} - 25}) = \frac{2 (\frac{- 2 x^{2} + 3 x + 51}{(x + 5) (x - 5)})}{\frac{(5 x + 5 \cdot 5) (x - 5) + 3 x + 1}{(x + 5) (x - 5)} \cdot (\frac{3 x + 1}{(x + 5) (x - 5)} - 5)}$

Step 6.3.5.2

Multiply $5$ by $5$ .

$y (\frac{3 x + 1}{x^{2} - 25}) = \frac{2 (\frac{- 2 x^{2} + 3 x + 51}{(x + 5) (x - 5)})}{\frac{(5 x + 25) (x - 5) + 3 x + 1}{(x + 5) (x - 5)} \cdot (\frac{3 x + 1}{(x + 5) (x - 5)} - 5)}$

Step 6.3.5.3

Expand $(5 x + 25) (x - 5)$ using the FOIL Method.

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Step 6.3.5.3.1

Apply the distributive property.

$y (\frac{3 x + 1}{x^{2} - 25}) = \frac{2 (\frac{- 2 x^{2} + 3 x + 51}{(x + 5) (x - 5)})}{\frac{5 x (x - 5) + 25 (x - 5) + 3 x + 1}{(x + 5) (x - 5)} \cdot (\frac{3 x + 1}{(x + 5) (x - 5)} - 5)}$

Step 6.3.5.3.2

Apply the distributive property.

$y (\frac{3 x + 1}{x^{2} - 25}) = \frac{2 (\frac{- 2 x^{2} + 3 x + 51}{(x + 5) (x - 5)})}{\frac{5 x \cdot x + 5 x \cdot - 5 + 25 (x - 5) + 3 x + 1}{(x + 5) (x - 5)} \cdot (\frac{3 x + 1}{(x + 5) (x - 5)} - 5)}$

Step 6.3.5.3.3

Apply the distributive property.

$y (\frac{3 x + 1}{x^{2} - 25}) = \frac{2 (\frac{- 2 x^{2} + 3 x + 51}{(x + 5) (x - 5)})}{\frac{5 x \cdot x + 5 x \cdot - 5 + 25 x + 25 \cdot - 5 + 3 x + 1}{(x + 5) (x - 5)} \cdot (\frac{3 x + 1}{(x + 5) (x - 5)} - 5)}$

Step 6.3.5.4

Simplify and combine like terms.

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Step 6.3.5.4.1

Simplify each term.

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Step 6.3.5.4.1.1

Multiply $x$ by $x$ by adding the exponents.

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Step 6.3.5.4.1.1.1

Move $x$ .

$y (\frac{3 x + 1}{x^{2} - 25}) = \frac{2 (\frac{- 2 x^{2} + 3 x + 51}{(x + 5) (x - 5)})}{\frac{5 (x \cdot x) + 5 x \cdot - 5 + 25 x + 25 \cdot - 5 + 3 x + 1}{(x + 5) (x - 5)} \cdot (\frac{3 x + 1}{(x + 5) (x - 5)} - 5)}$

Step 6.3.5.4.1.1.2

Multiply $x$ by $x$ .

$y (\frac{3 x + 1}{x^{2} - 25}) = \frac{2 (\frac{- 2 x^{2} + 3 x + 51}{(x + 5) (x - 5)})}{\frac{5 x^{2} + 5 x \cdot - 5 + 25 x + 25 \cdot - 5 + 3 x + 1}{(x + 5) (x - 5)} \cdot (\frac{3 x + 1}{(x + 5) (x - 5)} - 5)}$

Step 6.3.5.4.1.2

Multiply $- 5$ by $5$ .

$y (\frac{3 x + 1}{x^{2} - 25}) = \frac{2 (\frac{- 2 x^{2} + 3 x + 51}{(x + 5) (x - 5)})}{\frac{5 x^{2} - 25 x + 25 x + 25 \cdot - 5 + 3 x + 1}{(x + 5) (x - 5)} \cdot (\frac{3 x + 1}{(x + 5) (x - 5)} - 5)}$

Step 6.3.5.4.1.3

Multiply $25$ by $- 5$ .

$y (\frac{3 x + 1}{x^{2} - 25}) = \frac{2 (\frac{- 2 x^{2} + 3 x + 51}{(x + 5) (x - 5)})}{\frac{5 x^{2} - 25 x + 25 x - 125 + 3 x + 1}{(x + 5) (x - 5)} \cdot (\frac{3 x + 1}{(x + 5) (x - 5)} - 5)}$

Step 6.3.5.4.2

Add $- 25 x$ and $25 x$ .

$y (\frac{3 x + 1}{x^{2} - 25}) = \frac{2 (\frac{- 2 x^{2} + 3 x + 51}{(x + 5) (x - 5)})}{\frac{5 x^{2} + 0 - 125 + 3 x + 1}{(x + 5) (x - 5)} \cdot (\frac{3 x + 1}{(x + 5) (x - 5)} - 5)}$

Step 6.3.5.4.3

Add $5 x^{2}$ and $0$ .

$y (\frac{3 x + 1}{x^{2} - 25}) = \frac{2 (\frac{- 2 x^{2} + 3 x + 51}{(x + 5) (x - 5)})}{\frac{5 x^{2} - 125 + 3 x + 1}{(x + 5) (x - 5)} \cdot (\frac{3 x + 1}{(x + 5) (x - 5)} - 5)}$

Step 6.3.5.5

Add $- 125$ and $1$ .

$y (\frac{3 x + 1}{x^{2} - 25}) = \frac{2 (\frac{- 2 x^{2} + 3 x + 51}{(x + 5) (x - 5)})}{\frac{5 x^{2} + 3 x - 124}{(x + 5) (x - 5)} \cdot (\frac{3 x + 1}{(x + 5) (x - 5)} - 5)}$

Step 6.3.6

To write $- 5$ as a fraction with a common denominator, multiply by $\frac{(x + 5) (x - 5)}{(x + 5) (x - 5)}$ .

$y (\frac{3 x + 1}{x^{2} - 25}) = \frac{2 (\frac{- 2 x^{2} + 3 x + 51}{(x + 5) (x - 5)})}{\frac{5 x^{2} + 3 x - 124}{(x + 5) (x - 5)} \cdot (\frac{3 x + 1}{(x + 5) (x - 5)} - 5 \cdot \frac{(x + 5) (x - 5)}{(x + 5) (x - 5)})}$

Step 6.3.7

Combine $- 5$ and $\frac{(x + 5) (x - 5)}{(x + 5) (x - 5)}$ .

$y (\frac{3 x + 1}{x^{2} - 25}) = \frac{2 (\frac{- 2 x^{2} + 3 x + 51}{(x + 5) (x - 5)})}{\frac{5 x^{2} + 3 x - 124}{(x + 5) (x - 5)} \cdot (\frac{3 x + 1}{(x + 5) (x - 5)} + \frac{- 5 ((x + 5) (x - 5))}{(x + 5) (x - 5)})}$

Step 6.3.8

Combine the numerators over the common denominator.

$y (\frac{3 x + 1}{x^{2} - 25}) = \frac{2 (\frac{- 2 x^{2} + 3 x + 51}{(x + 5) (x - 5)})}{\frac{5 x^{2} + 3 x - 124}{(x + 5) (x - 5)} \cdot \frac{3 x + 1 - 5 ((x + 5) (x - 5))}{(x + 5) (x - 5)}}$

Step 6.3.9

Rewrite $\frac{3 x + 1 - 5 ((x + 5) (x - 5))}{(x + 5) (x - 5)}$ in a factored form.

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Step 6.3.9.1

Expand $(x + 5) (x - 5)$ using the FOIL Method.

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Step 6.3.9.1.1

Apply the distributive property.

$y (\frac{3 x + 1}{x^{2} - 25}) = \frac{2 (\frac{- 2 x^{2} + 3 x + 51}{(x + 5) (x - 5)})}{\frac{5 x^{2} + 3 x - 124}{(x + 5) (x - 5)} \cdot \frac{3 x + 1 - 5 (x (x - 5) + 5 (x - 5))}{(x + 5) (x - 5)}}$

Step 6.3.9.1.2

Apply the distributive property.

$y (\frac{3 x + 1}{x^{2} - 25}) = \frac{2 (\frac{- 2 x^{2} + 3 x + 51}{(x + 5) (x - 5)})}{\frac{5 x^{2} + 3 x - 124}{(x + 5) (x - 5)} \cdot \frac{3 x + 1 - 5 (x \cdot x + x \cdot - 5 + 5 (x - 5))}{(x + 5) (x - 5)}}$

Step 6.3.9.1.3

Apply the distributive property.

$y (\frac{3 x + 1}{x^{2} - 25}) = \frac{2 (\frac{- 2 x^{2} + 3 x + 51}{(x + 5) (x - 5)})}{\frac{5 x^{2} + 3 x - 124}{(x + 5) (x - 5)} \cdot \frac{3 x + 1 - 5 (x \cdot x + x \cdot - 5 + 5 x + 5 \cdot - 5)}{(x + 5) (x - 5)}}$

Step 6.3.9.2

Combine the opposite terms in $x \cdot x + x \cdot - 5 + 5 x + 5 \cdot - 5$ .

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Step 6.3.9.2.1

Reorder the factors in the terms $x \cdot - 5$ and $5 x$ .

$y (\frac{3 x + 1}{x^{2} - 25}) = \frac{2 (\frac{- 2 x^{2} + 3 x + 51}{(x + 5) (x - 5)})}{\frac{5 x^{2} + 3 x - 124}{(x + 5) (x - 5)} \cdot \frac{3 x + 1 - 5 (x \cdot x - 5 x + 5 x + 5 \cdot - 5)}{(x + 5) (x - 5)}}$

Step 6.3.9.2.2

Add $- 5 x$ and $5 x$ .

$y (\frac{3 x + 1}{x^{2} - 25}) = \frac{2 (\frac{- 2 x^{2} + 3 x + 51}{(x + 5) (x - 5)})}{\frac{5 x^{2} + 3 x - 124}{(x + 5) (x - 5)} \cdot \frac{3 x + 1 - 5 (x \cdot x + 0 + 5 \cdot - 5)}{(x + 5) (x - 5)}}$

Step 6.3.9.2.3

Add $x \cdot x$ and $0$ .

$y (\frac{3 x + 1}{x^{2} - 25}) = \frac{2 (\frac{- 2 x^{2} + 3 x + 51}{(x + 5) (x - 5)})}{\frac{5 x^{2} + 3 x - 124}{(x + 5) (x - 5)} \cdot \frac{3 x + 1 - 5 (x \cdot x + 5 \cdot - 5)}{(x + 5) (x - 5)}}$

Step 6.3.9.3

Simplify each term.

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Step 6.3.9.3.1

Multiply $x$ by $x$ .

$y (\frac{3 x + 1}{x^{2} - 25}) = \frac{2 (\frac{- 2 x^{2} + 3 x + 51}{(x + 5) (x - 5)})}{\frac{5 x^{2} + 3 x - 124}{(x + 5) (x - 5)} \cdot \frac{3 x + 1 - 5 (x^{2} + 5 \cdot - 5)}{(x + 5) (x - 5)}}$

Step 6.3.9.3.2

Multiply $5$ by $- 5$ .

$y (\frac{3 x + 1}{x^{2} - 25}) = \frac{2 (\frac{- 2 x^{2} + 3 x + 51}{(x + 5) (x - 5)})}{\frac{5 x^{2} + 3 x - 124}{(x + 5) (x - 5)} \cdot \frac{3 x + 1 - 5 (x^{2} - 25)}{(x + 5) (x - 5)}}$

Step 6.3.9.4

Apply the distributive property.

$y (\frac{3 x + 1}{x^{2} - 25}) = \frac{2 (\frac{- 2 x^{2} + 3 x + 51}{(x + 5) (x - 5)})}{\frac{5 x^{2} + 3 x - 124}{(x + 5) (x - 5)} \cdot \frac{3 x + 1 - 5 x^{2} - 5 \cdot - 25}{(x + 5) (x - 5)}}$

Step 6.3.9.5

Multiply $- 5$ by $- 25$ .

$y (\frac{3 x + 1}{x^{2} - 25}) = \frac{2 (\frac{- 2 x^{2} + 3 x + 51}{(x + 5) (x - 5)})}{\frac{5 x^{2} + 3 x - 124}{(x + 5) (x - 5)} \cdot \frac{3 x + 1 - 5 x^{2} + 125}{(x + 5) (x - 5)}}$

Step 6.3.9.6

Add $1$ and $125$ .

$y (\frac{3 x + 1}{x^{2} - 25}) = \frac{2 (\frac{- 2 x^{2} + 3 x + 51}{(x + 5) (x - 5)})}{\frac{5 x^{2} + 3 x - 124}{(x + 5) (x - 5)} \cdot \frac{3 x - 5 x^{2} + 126}{(x + 5) (x - 5)}}$

Step 6.3.9.7

Reorder terms.

$y (\frac{3 x + 1}{x^{2} - 25}) = \frac{2 (\frac{- 2 x^{2} + 3 x + 51}{(x + 5) (x - 5)})}{\frac{5 x^{2} + 3 x - 124}{(x + 5) (x - 5)} \cdot \frac{- 5 x^{2} + 3 x + 126}{(x + 5) (x - 5)}}$

Step 7

Combine fractions.

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Step 7.1

Combine $2$ and $\frac{- 2 x^{2} + 3 x + 51}{(x + 5) (x - 5)}$ .

$y (\frac{3 x + 1}{x^{2} - 25}) = \frac{\frac{2 (- 2 x^{2} + 3 x + 51)}{(x + 5) (x - 5)}}{\frac{5 x^{2} + 3 x - 124}{(x + 5) (x - 5)} \cdot \frac{- 5 x^{2} + 3 x + 126}{(x + 5) (x - 5)}}$

Step 7.2

Multiply $\frac{5 x^{2} + 3 x - 124}{(x + 5) (x - 5)}$ by $\frac{- 5 x^{2} + 3 x + 126}{(x + 5) (x - 5)}$ .

$y (\frac{3 x + 1}{x^{2} - 25}) = \frac{\frac{2 (- 2 x^{2} + 3 x + 51)}{(x + 5) (x - 5)}}{\frac{(5 x^{2} + 3 x - 124) (- 5 x^{2} + 3 x + 126)}{(x + 5) (x - 5) ((x + 5) (x - 5))}}$

Step 8

Simplify the denominator.

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Step 8.1

Raise $x + 5$ to the power of $1$ .

$y (\frac{3 x + 1}{x^{2} - 25}) = \frac{\frac{2 (- 2 x^{2} + 3 x + 51)}{(x + 5) (x - 5)}}{\frac{(5 x^{2} + 3 x - 124) (- 5 x^{2} + 3 x + 126)}{(x + 5) (x + 5) (x - 5) (x - 5)}}$

Step 8.2

Raise $x + 5$ to the power of $1$ .

$y (\frac{3 x + 1}{x^{2} - 25}) = \frac{\frac{2 (- 2 x^{2} + 3 x + 51)}{(x + 5) (x - 5)}}{\frac{(5 x^{2} + 3 x - 124) (- 5 x^{2} + 3 x + 126)}{(x + 5) (x + 5) (x - 5) (x - 5)}}$

Step 8.3

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

$y (\frac{3 x + 1}{x^{2} - 25}) = \frac{\frac{2 (- 2 x^{2} + 3 x + 51)}{(x + 5) (x - 5)}}{\frac{(5 x^{2} + 3 x - 124) (- 5 x^{2} + 3 x + 126)}{{(x + 5)}^{1 + 1} (x - 5) (x - 5)}}$

Step 8.4

Add $1$ and $1$ .

$y (\frac{3 x + 1}{x^{2} - 25}) = \frac{\frac{2 (- 2 x^{2} + 3 x + 51)}{(x + 5) (x - 5)}}{\frac{(5 x^{2} + 3 x - 124) (- 5 x^{2} + 3 x + 126)}{{(x + 5)}^{2} (x - 5) (x - 5)}}$

Step 8.5

Raise $x - 5$ to the power of $1$ .

$y (\frac{3 x + 1}{x^{2} - 25}) = \frac{\frac{2 (- 2 x^{2} + 3 x + 51)}{(x + 5) (x - 5)}}{\frac{(5 x^{2} + 3 x - 124) (- 5 x^{2} + 3 x + 126)}{{(x + 5)}^{2} ((x - 5) (x - 5))}}$

Step 8.6

Raise $x - 5$ to the power of $1$ .

$y (\frac{3 x + 1}{x^{2} - 25}) = \frac{\frac{2 (- 2 x^{2} + 3 x + 51)}{(x + 5) (x - 5)}}{\frac{(5 x^{2} + 3 x - 124) (- 5 x^{2} + 3 x + 126)}{{(x + 5)}^{2} ((x - 5) (x - 5))}}$

Step 8.7

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

$y (\frac{3 x + 1}{x^{2} - 25}) = \frac{\frac{2 (- 2 x^{2} + 3 x + 51)}{(x + 5) (x - 5)}}{\frac{(5 x^{2} + 3 x - 124) (- 5 x^{2} + 3 x + 126)}{{(x + 5)}^{2} {(x - 5)}^{1 + 1}}}$

Step 8.8

Add $1$ and $1$ .

$y (\frac{3 x + 1}{x^{2} - 25}) = \frac{\frac{2 (- 2 x^{2} + 3 x + 51)}{(x + 5) (x - 5)}}{\frac{(5 x^{2} + 3 x - 124) (- 5 x^{2} + 3 x + 126)}{{(x + 5)}^{2} {(x - 5)}^{2}}}$

Step 9

Multiply the numerator by the reciprocal of the denominator.

$y (\frac{3 x + 1}{x^{2} - 25}) = \frac{2 (- 2 x^{2} + 3 x + 51)}{(x + 5) (x - 5)} \cdot \frac{{(x + 5)}^{2} {(x - 5)}^{2}}{(5 x^{2} + 3 x - 124) (- 5 x^{2} + 3 x + 126)}$

Step 10

Simplify terms.

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Step 10.1

Combine.

$y (\frac{3 x + 1}{x^{2} - 25}) = \frac{2 (- 2 x^{2} + 3 x + 51) ({(x + 5)}^{2} {(x - 5)}^{2})}{(x + 5) (x - 5) ((5 x^{2} + 3 x - 124) (- 5 x^{2} + 3 x + 126))}$

Step 10.2

Cancel the common factor of ${(x + 5)}^{2}$ and $x + 5$ .

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Step 10.2.1

Factor $x + 5$ out of $2 (- 2 x^{2} + 3 x + 51) ({(x + 5)}^{2} {(x - 5)}^{2})$ .

$y (\frac{3 x + 1}{x^{2} - 25}) = \frac{(x + 5) (2 (- 2 x^{2} + 3 x + 51) ((x + 5) {(x - 5)}^{2}))}{(x + 5) (x - 5) ((5 x^{2} + 3 x - 124) (- 5 x^{2} + 3 x + 126))}$

Step 10.2.2

Cancel the common factors.

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Step 10.2.2.1

Factor $x + 5$ out of $(x + 5) (x - 5) ((5 x^{2} + 3 x - 124) (- 5 x^{2} + 3 x + 126))$ .

$y (\frac{3 x + 1}{x^{2} - 25}) = \frac{(x + 5) (2 (- 2 x^{2} + 3 x + 51) ((x + 5) {(x - 5)}^{2}))}{(x + 5) ((x - 5) ((5 x^{2} + 3 x - 124) (- 5 x^{2} + 3 x + 126)))}$

Step 10.2.2.2

Cancel the common factor.

$y (\frac{3 x + 1}{x^{2} - 25}) = \frac{(x + 5) (2 (- 2 x^{2} + 3 x + 51) ((x + 5) {(x - 5)}^{2}))}{(x + 5) ((x - 5) ((5 x^{2} + 3 x - 124) (- 5 x^{2} + 3 x + 126)))}$

Step 10.2.2.3

Rewrite the expression.

$y (\frac{3 x + 1}{x^{2} - 25}) = \frac{2 (- 2 x^{2} + 3 x + 51) ((x + 5) {(x - 5)}^{2})}{(x - 5) ((5 x^{2} + 3 x - 124) (- 5 x^{2} + 3 x + 126))}$

Step 10.3

Cancel the common factor of ${(x - 5)}^{2}$ and $x - 5$ .

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Step 10.3.1

Factor $x - 5$ out of $2 (- 2 x^{2} + 3 x + 51) ((x + 5) {(x - 5)}^{2})$ .

$y (\frac{3 x + 1}{x^{2} - 25}) = \frac{(x - 5) (2 (- 2 x^{2} + 3 x + 51) ((x + 5) (x - 5)))}{(x - 5) ((5 x^{2} + 3 x - 124) (- 5 x^{2} + 3 x + 126))}$

Step 10.3.2

Cancel the common factors.

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Step 10.3.2.1

Cancel the common factor.

$y (\frac{3 x + 1}{x^{2} - 25}) = \frac{(x - 5) (2 (- 2 x^{2} + 3 x + 51) ((x + 5) (x - 5)))}{(x - 5) ((5 x^{2} + 3 x - 124) (- 5 x^{2} + 3 x + 126))}$

Step 10.3.2.2

Rewrite the expression.

$y (\frac{3 x + 1}{x^{2} - 25}) = \frac{2 (- 2 x^{2} + 3 x + 51) ((x + 5) (x - 5))}{(5 x^{2} + 3 x - 124) (- 5 x^{2} + 3 x + 126)}$

Step 11

Simplify the numerator.

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Step 11.1

Rewrite.

$y (\frac{3 x + 1}{x^{2} - 25}) = \frac{2 (- 2 x^{2} + 3 x + 51) ({(x + 5)}^{2} {(x - 5)}^{2})}{(5 x^{2} + 3 x - 124) (- 5 x^{2} + 3 x + 126)}$

Step 11.2

Factor $x + 5$ out of ${(x + 5)}^{2}$ .

$y (\frac{3 x + 1}{x^{2} - 25}) = \frac{2 (- 2 x^{2} + 3 x + 51) ((x + 5) (x + 5) {(x - 5)}^{2})}{(5 x^{2} + 3 x - 124) (- 5 x^{2} + 3 x + 126)}$

Step 11.3

Rewrite.

$y (\frac{3 x + 1}{x^{2} - 25}) = \frac{2 (- 2 x^{2} + 3 x + 51) ((x + 5) {(x - 5)}^{2})}{(5 x^{2} + 3 x - 124) (- 5 x^{2} + 3 x + 126)}$

Step 11.4

Simplify.

$y (\frac{3 x + 1}{x^{2} - 25}) = \frac{2 (- 2 x^{2} + 3 x + 51) ((x + 5) {(x - 5)}^{2})}{(5 x^{2} + 3 x - 124) (- 5 x^{2} + 3 x + 126)}$

Step 11.5

Factor $x - 5$ out of ${(x - 5)}^{2}$ .

$y (\frac{3 x + 1}{x^{2} - 25}) = \frac{2 (- 2 x^{2} + 3 x + 51) ((x + 5) ((x - 5) (x - 5)))}{(5 x^{2} + 3 x - 124) (- 5 x^{2} + 3 x + 126)}$

Step 11.6

Rewrite.

$y (\frac{3 x + 1}{x^{2} - 25}) = \frac{2 (- 2 x^{2} + 3 x + 51) ((x + 5) (x - 5))}{(5 x^{2} + 3 x - 124) (- 5 x^{2} + 3 x + 126)}$

Step 11.7

Simplify.

$y (\frac{3 x + 1}{x^{2} - 25}) = \frac{2 (- 2 x^{2} + 3 x + 51) ((x + 5) (x - 5))}{(5 x^{2} + 3 x - 124) (- 5 x^{2} + 3 x + 126)}$

Step 11.8

Remove unnecessary parentheses.

$y (\frac{3 x + 1}{x^{2} - 25}) = \frac{2 (- 2 x^{2} + 3 x + 51) (x + 5) (x - 5)}{(5 x^{2} + 3 x - 124) (- 5 x^{2} + 3 x + 126)}$

Step 12

Simplify terms.

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Step 12.1

Factor $- 1$ out of $- 2 x^{2}$ .

$y (\frac{3 x + 1}{x^{2} - 25}) = \frac{2 (- (2 x^{2}) + 3 x + 51) (x + 5) (x - 5)}{(5 x^{2} + 3 x - 124) (- 5 x^{2} + 3 x + 126)}$

Step 12.2

Factor $- 1$ out of $3 x$ .

$y (\frac{3 x + 1}{x^{2} - 25}) = \frac{2 (- (2 x^{2}) - (- 3 x) + 51) (x + 5) (x - 5)}{(5 x^{2} + 3 x - 124) (- 5 x^{2} + 3 x + 126)}$

Step 12.3

Factor $- 1$ out of $- (2 x^{2}) - (- 3 x)$ .

$y (\frac{3 x + 1}{x^{2} - 25}) = \frac{2 (- (2 x^{2} - 3 x) + 51) (x + 5) (x - 5)}{(5 x^{2} + 3 x - 124) (- 5 x^{2} + 3 x + 126)}$

Step 12.4

Rewrite $51$ as $- 1 (- 51)$ .

$y (\frac{3 x + 1}{x^{2} - 25}) = \frac{2 (- (2 x^{2} - 3 x) - 1 \cdot - 51) (x + 5) (x - 5)}{(5 x^{2} + 3 x - 124) (- 5 x^{2} + 3 x + 126)}$

Step 12.5

Factor $- 1$ out of $- (2 x^{2} - 3 x) - 1 (- 51)$ .

$y (\frac{3 x + 1}{x^{2} - 25}) = \frac{2 (- (2 x^{2} - 3 x - 51)) (x + 5) (x - 5)}{(5 x^{2} + 3 x - 124) (- 5 x^{2} + 3 x + 126)}$

Step 12.6

Rewrite $- (2 x^{2} - 3 x - 51)$ as $- 1 (2 x^{2} - 3 x - 51)$ .

$y (\frac{3 x + 1}{x^{2} - 25}) = \frac{2 (- 1 (2 x^{2} - 3 x - 51)) (x + 5) (x - 5)}{(5 x^{2} + 3 x - 124) (- 5 x^{2} + 3 x + 126)}$

Step 12.7

Factor $- 1$ out of $- 5 x^{2}$ .

$y (\frac{3 x + 1}{x^{2} - 25}) = \frac{2 (- 1 (2 x^{2} - 3 x - 51)) (x + 5) (x - 5)}{(5 x^{2} + 3 x - 124) (- (5 x^{2}) + 3 x + 126)}$

Step 12.8

Factor $- 1$ out of $3 x$ .

$y (\frac{3 x + 1}{x^{2} - 25}) = \frac{2 (- 1 (2 x^{2} - 3 x - 51)) (x + 5) (x - 5)}{(5 x^{2} + 3 x - 124) (- (5 x^{2}) - (- 3 x) + 126)}$

Step 12.9

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

$y (\frac{3 x + 1}{x^{2} - 25}) = \frac{2 (- 1 (2 x^{2} - 3 x - 51)) (x + 5) (x - 5)}{(5 x^{2} + 3 x - 124) (- (5 x^{2} - 3 x) + 126)}$

Step 12.10

Rewrite $126$ as $- 1 (- 126)$ .

$y (\frac{3 x + 1}{x^{2} - 25}) = \frac{2 (- 1 (2 x^{2} - 3 x - 51)) (x + 5) (x - 5)}{(5 x^{2} + 3 x - 124) (- (5 x^{2} - 3 x) - 1 \cdot - 126)}$

Step 12.11

Factor $- 1$ out of $- (5 x^{2} - 3 x) - 1 (- 126)$ .

$y (\frac{3 x + 1}{x^{2} - 25}) = \frac{2 (- 1 (2 x^{2} - 3 x - 51)) (x + 5) (x - 5)}{(5 x^{2} + 3 x - 124) (- (5 x^{2} - 3 x - 126))}$

Step 12.12

Rewrite $- (5 x^{2} - 3 x - 126)$ as $- 1 (5 x^{2} - 3 x - 126)$ .

$y (\frac{3 x + 1}{x^{2} - 25}) = \frac{2 (- 1 (2 x^{2} - 3 x - 51)) (x + 5) (x - 5)}{(5 x^{2} + 3 x - 124) (- 1 (5 x^{2} - 3 x - 126))}$

Step 12.13

Cancel the common factor.

$y (\frac{3 x + 1}{x^{2} - 25}) = \frac{2 (- 1 (2 x^{2} - 3 x - 51)) (x + 5) (x - 5)}{(5 x^{2} + 3 x - 124) (- 1 (5 x^{2} - 3 x - 126))}$

Step 12.14

Rewrite the expression.

$y (\frac{3 x + 1}{x^{2} - 25}) = \frac{(2 (2 x^{2} - 3 x - 51) (x + 5)) (x - 5)}{(5 x^{2} + 3 x - 124) (5 x^{2} - 3 x - 126)}$

Step 12.15

Reorder factors in $\frac{(2 (2 x^{2} - 3 x - 51) (x + 5)) (x - 5)}{(5 x^{2} + 3 x - 124) (5 x^{2} - 3 x - 126)}$ .

$y (\frac{3 x + 1}{x^{2} - 25}) = \frac{2 (2 x^{2} - 3 x - 51) (x + 5) (x - 5)}{(5 x^{2} + 3 x - 124) (5 x^{2} - 3 x - 126)}$