Finite Math Examples

$\frac{y - 8}{2 y^{2} + 11 + 12} - \frac{y + 6}{2 y^{2} - 7 y - 15}$

Step 1

Simplify each term.

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Step 1.1

Add $11$ and $12$ .

$\frac{y - 8}{2 y^{2} + 23} - \frac{y + 6}{2 y^{2} - 7 y - 15}$

Step 1.2

Factor by grouping.

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Step 1.2.1

For a polynomial of the form $a x^{2} + b x + c$ , rewrite the middle term as a sum of two terms whose product is $a \cdot c = 2 \cdot - 15 = - 30$ and whose sum is $b = - 7$ .

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Step 1.2.1.1

Factor $- 7$ out of $- 7 y$ .

$\frac{y - 8}{2 y^{2} + 23} - \frac{y + 6}{2 y^{2} - 7 (y) - 15}$

Step 1.2.1.2

Rewrite $- 7$ as $3$ plus $- 10$

$\frac{y - 8}{2 y^{2} + 23} - \frac{y + 6}{2 y^{2} + (3 - 10) y - 15}$

Step 1.2.1.3

Apply the distributive property.

$\frac{y - 8}{2 y^{2} + 23} - \frac{y + 6}{2 y^{2} + 3 y - 10 y - 15}$

Step 1.2.2

Factor out the greatest common factor from each group.

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Step 1.2.2.1

Group the first two terms and the last two terms.

$\frac{y - 8}{2 y^{2} + 23} - \frac{y + 6}{(2 y^{2} + 3 y) - 10 y - 15}$

Step 1.2.2.2

Factor out the greatest common factor (GCF) from each group.

$\frac{y - 8}{2 y^{2} + 23} - \frac{y + 6}{y (2 y + 3) - 5 (2 y + 3)}$

Step 1.2.3

Factor the polynomial by factoring out the greatest common factor, $2 y + 3$ .

$\frac{y - 8}{2 y^{2} + 23} - \frac{y + 6}{(2 y + 3) (y - 5)}$

Step 2

To write $\frac{y - 8}{2 y^{2} + 23}$ as a fraction with a common denominator, multiply by $\frac{(2 y + 3) (y - 5)}{(2 y + 3) (y - 5)}$ .

$\frac{y - 8}{2 y^{2} + 23} \cdot \frac{(2 y + 3) (y - 5)}{(2 y + 3) (y - 5)} - \frac{y + 6}{(2 y + 3) (y - 5)}$

Step 3

To write $- \frac{y + 6}{(2 y + 3) (y - 5)}$ as a fraction with a common denominator, multiply by $\frac{2 y^{2} + 23}{2 y^{2} + 23}$ .

$\frac{y - 8}{2 y^{2} + 23} \cdot \frac{(2 y + 3) (y - 5)}{(2 y + 3) (y - 5)} - \frac{y + 6}{(2 y + 3) (y - 5)} \cdot \frac{2 y^{2} + 23}{2 y^{2} + 23}$

Step 4

Write each expression with a common denominator of $(2 y^{2} + 23) (2 y + 3) (y - 5)$ , by multiplying each by an appropriate factor of $1$ .

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Step 4.1

Multiply $\frac{y - 8}{2 y^{2} + 23}$ by $\frac{(2 y + 3) (y - 5)}{(2 y + 3) (y - 5)}$ .

$\frac{(y - 8) ((2 y + 3) (y - 5))}{(2 y^{2} + 23) ((2 y + 3) (y - 5))} - \frac{y + 6}{(2 y + 3) (y - 5)} \cdot \frac{2 y^{2} + 23}{2 y^{2} + 23}$

Step 4.2

Multiply $\frac{y + 6}{(2 y + 3) (y - 5)}$ by $\frac{2 y^{2} + 23}{2 y^{2} + 23}$ .

$\frac{(y - 8) ((2 y + 3) (y - 5))}{(2 y^{2} + 23) ((2 y + 3) (y - 5))} - \frac{(y + 6) (2 y^{2} + 23)}{(2 y + 3) (y - 5) (2 y^{2} + 23)}$

Step 4.3

Reorder the factors of $(2 y^{2} + 23) ((2 y + 3) (y - 5))$ .

$\frac{(y - 8) ((2 y + 3) (y - 5))}{(2 y + 3) (2 y^{2} + 23) (y - 5)} - \frac{(y + 6) (2 y^{2} + 23)}{(2 y + 3) (y - 5) (2 y^{2} + 23)}$

Step 4.4

Reorder the factors of $(2 y + 3) (y - 5) (2 y^{2} + 23)$ .

$\frac{(y - 8) ((2 y + 3) (y - 5))}{(2 y + 3) (2 y^{2} + 23) (y - 5)} - \frac{(y + 6) (2 y^{2} + 23)}{(2 y + 3) (2 y^{2} + 23) (y - 5)}$

Step 5

Combine the numerators over the common denominator.

$\frac{(y - 8) ((2 y + 3) (y - 5)) - (y + 6) (2 y^{2} + 23)}{(2 y + 3) (2 y^{2} + 23) (y - 5)}$

Step 6

Simplify the numerator.

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Step 6.1

Expand $(y - 8) (2 y + 3)$ using the FOIL Method.

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Step 6.1.1

Apply the distributive property.

$\frac{(y (2 y + 3) - 8 (2 y + 3)) (y - 5) - (y + 6) (2 y^{2} + 23)}{(2 y + 3) (2 y^{2} + 23) (y - 5)}$

Step 6.1.2

Apply the distributive property.

$\frac{(y (2 y) + y \cdot 3 - 8 (2 y + 3)) (y - 5) - (y + 6) (2 y^{2} + 23)}{(2 y + 3) (2 y^{2} + 23) (y - 5)}$

Step 6.1.3

Apply the distributive property.

$\frac{(y (2 y) + y \cdot 3 - 8 (2 y) - 8 \cdot 3) (y - 5) - (y + 6) (2 y^{2} + 23)}{(2 y + 3) (2 y^{2} + 23) (y - 5)}$

Step 6.2

Simplify and combine like terms.

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Step 6.2.1

Simplify each term.

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Step 6.2.1.1

Rewrite using the commutative property of multiplication.

$\frac{(2 y \cdot y + y \cdot 3 - 8 (2 y) - 8 \cdot 3) (y - 5) - (y + 6) (2 y^{2} + 23)}{(2 y + 3) (2 y^{2} + 23) (y - 5)}$

Step 6.2.1.2

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

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Step 6.2.1.2.1

Move $y$ .

$\frac{(2 (y \cdot y) + y \cdot 3 - 8 (2 y) - 8 \cdot 3) (y - 5) - (y + 6) (2 y^{2} + 23)}{(2 y + 3) (2 y^{2} + 23) (y - 5)}$

Step 6.2.1.2.2

Multiply $y$ by $y$ .

$\frac{(2 y^{2} + y \cdot 3 - 8 (2 y) - 8 \cdot 3) (y - 5) - (y + 6) (2 y^{2} + 23)}{(2 y + 3) (2 y^{2} + 23) (y - 5)}$

Step 6.2.1.3

Move $3$ to the left of $y$ .

$\frac{(2 y^{2} + 3 \cdot y - 8 (2 y) - 8 \cdot 3) (y - 5) - (y + 6) (2 y^{2} + 23)}{(2 y + 3) (2 y^{2} + 23) (y - 5)}$

Step 6.2.1.4

Multiply $2$ by $- 8$ .

$\frac{(2 y^{2} + 3 y - 16 y - 8 \cdot 3) (y - 5) - (y + 6) (2 y^{2} + 23)}{(2 y + 3) (2 y^{2} + 23) (y - 5)}$

Step 6.2.1.5

Multiply $- 8$ by $3$ .

$\frac{(2 y^{2} + 3 y - 16 y - 24) (y - 5) - (y + 6) (2 y^{2} + 23)}{(2 y + 3) (2 y^{2} + 23) (y - 5)}$

Step 6.2.2

Subtract $16 y$ from $3 y$ .

$\frac{(2 y^{2} - 13 y - 24) (y - 5) - (y + 6) (2 y^{2} + 23)}{(2 y + 3) (2 y^{2} + 23) (y - 5)}$

Step 6.3

Expand $(2 y^{2} - 13 y - 24) (y - 5)$ by multiplying each term in the first expression by each term in the second expression.

$\frac{2 y^{2} y + 2 y^{2} \cdot - 5 - 13 y \cdot y - 13 y \cdot - 5 - 24 y - 24 \cdot - 5 - (y + 6) (2 y^{2} + 23)}{(2 y + 3) (2 y^{2} + 23) (y - 5)}$

Step 6.4

Simplify each term.

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Step 6.4.1

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

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Step 6.4.1.1

Move $y$ .

$\frac{2 (y \cdot y^{2}) + 2 y^{2} \cdot - 5 - 13 y \cdot y - 13 y \cdot - 5 - 24 y - 24 \cdot - 5 - (y + 6) (2 y^{2} + 23)}{(2 y + 3) (2 y^{2} + 23) (y - 5)}$

Step 6.4.1.2

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

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Step 6.4.1.2.1

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

$\frac{2 (y^{1} y^{2}) + 2 y^{2} \cdot - 5 - 13 y \cdot y - 13 y \cdot - 5 - 24 y - 24 \cdot - 5 - (y + 6) (2 y^{2} + 23)}{(2 y + 3) (2 y^{2} + 23) (y - 5)}$

Step 6.4.1.2.2

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

$\frac{2 y^{1 + 2} + 2 y^{2} \cdot - 5 - 13 y \cdot y - 13 y \cdot - 5 - 24 y - 24 \cdot - 5 - (y + 6) (2 y^{2} + 23)}{(2 y + 3) (2 y^{2} + 23) (y - 5)}$

Step 6.4.1.3

Add $1$ and $2$ .

$\frac{2 y^{3} + 2 y^{2} \cdot - 5 - 13 y \cdot y - 13 y \cdot - 5 - 24 y - 24 \cdot - 5 - (y + 6) (2 y^{2} + 23)}{(2 y + 3) (2 y^{2} + 23) (y - 5)}$

Step 6.4.2

Multiply $- 5$ by $2$ .

$\frac{2 y^{3} - 10 y^{2} - 13 y \cdot y - 13 y \cdot - 5 - 24 y - 24 \cdot - 5 - (y + 6) (2 y^{2} + 23)}{(2 y + 3) (2 y^{2} + 23) (y - 5)}$

Step 6.4.3

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

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Step 6.4.3.1

Move $y$ .

$\frac{2 y^{3} - 10 y^{2} - 13 (y \cdot y) - 13 y \cdot - 5 - 24 y - 24 \cdot - 5 - (y + 6) (2 y^{2} + 23)}{(2 y + 3) (2 y^{2} + 23) (y - 5)}$

Step 6.4.3.2

Multiply $y$ by $y$ .

$\frac{2 y^{3} - 10 y^{2} - 13 y^{2} - 13 y \cdot - 5 - 24 y - 24 \cdot - 5 - (y + 6) (2 y^{2} + 23)}{(2 y + 3) (2 y^{2} + 23) (y - 5)}$

Step 6.4.4

Multiply $- 5$ by $- 13$ .

$\frac{2 y^{3} - 10 y^{2} - 13 y^{2} + 65 y - 24 y - 24 \cdot - 5 - (y + 6) (2 y^{2} + 23)}{(2 y + 3) (2 y^{2} + 23) (y - 5)}$

Step 6.4.5

Multiply $- 24$ by $- 5$ .

$\frac{2 y^{3} - 10 y^{2} - 13 y^{2} + 65 y - 24 y + 120 - (y + 6) (2 y^{2} + 23)}{(2 y + 3) (2 y^{2} + 23) (y - 5)}$

Step 6.5

Subtract $13 y^{2}$ from $- 10 y^{2}$ .

$\frac{2 y^{3} - 23 y^{2} + 65 y - 24 y + 120 - (y + 6) (2 y^{2} + 23)}{(2 y + 3) (2 y^{2} + 23) (y - 5)}$

Step 6.6

Subtract $24 y$ from $65 y$ .

$\frac{2 y^{3} - 23 y^{2} + 41 y + 120 - (y + 6) (2 y^{2} + 23)}{(2 y + 3) (2 y^{2} + 23) (y - 5)}$

Step 6.7

Apply the distributive property.

$\frac{2 y^{3} - 23 y^{2} + 41 y + 120 + (- y - 1 \cdot 6) (2 y^{2} + 23)}{(2 y + 3) (2 y^{2} + 23) (y - 5)}$

Step 6.8

Multiply $- 1$ by $6$ .

$\frac{2 y^{3} - 23 y^{2} + 41 y + 120 + (- y - 6) (2 y^{2} + 23)}{(2 y + 3) (2 y^{2} + 23) (y - 5)}$

Step 6.9

Expand $(- y - 6) (2 y^{2} + 23)$ using the FOIL Method.

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Step 6.9.1

Apply the distributive property.

$\frac{2 y^{3} - 23 y^{2} + 41 y + 120 - y (2 y^{2} + 23) - 6 (2 y^{2} + 23)}{(2 y + 3) (2 y^{2} + 23) (y - 5)}$

Step 6.9.2

Apply the distributive property.

$\frac{2 y^{3} - 23 y^{2} + 41 y + 120 - y (2 y^{2}) - y \cdot 23 - 6 (2 y^{2} + 23)}{(2 y + 3) (2 y^{2} + 23) (y - 5)}$

Step 6.9.3

Apply the distributive property.

$\frac{2 y^{3} - 23 y^{2} + 41 y + 120 - y (2 y^{2}) - y \cdot 23 - 6 (2 y^{2}) - 6 \cdot 23}{(2 y + 3) (2 y^{2} + 23) (y - 5)}$

Step 6.10

Simplify each term.

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Step 6.10.1

Rewrite using the commutative property of multiplication.

$\frac{2 y^{3} - 23 y^{2} + 41 y + 120 - 1 \cdot 2 y \cdot y^{2} - y \cdot 23 - 6 (2 y^{2}) - 6 \cdot 23}{(2 y + 3) (2 y^{2} + 23) (y - 5)}$

Step 6.10.2

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

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Step 6.10.2.1

Move $y^{2}$ .

$\frac{2 y^{3} - 23 y^{2} + 41 y + 120 - 1 \cdot 2 (y^{2} y) - y \cdot 23 - 6 (2 y^{2}) - 6 \cdot 23}{(2 y + 3) (2 y^{2} + 23) (y - 5)}$

Step 6.10.2.2

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

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Step 6.10.2.2.1

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

$\frac{2 y^{3} - 23 y^{2} + 41 y + 120 - 1 \cdot 2 (y^{2} y^{1}) - y \cdot 23 - 6 (2 y^{2}) - 6 \cdot 23}{(2 y + 3) (2 y^{2} + 23) (y - 5)}$

Step 6.10.2.2.2

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

$\frac{2 y^{3} - 23 y^{2} + 41 y + 120 - 1 \cdot 2 y^{2 + 1} - y \cdot 23 - 6 (2 y^{2}) - 6 \cdot 23}{(2 y + 3) (2 y^{2} + 23) (y - 5)}$

Step 6.10.2.3

Add $2$ and $1$ .

$\frac{2 y^{3} - 23 y^{2} + 41 y + 120 - 1 \cdot 2 y^{3} - y \cdot 23 - 6 (2 y^{2}) - 6 \cdot 23}{(2 y + 3) (2 y^{2} + 23) (y - 5)}$

Step 6.10.3

Multiply $- 1$ by $2$ .

$\frac{2 y^{3} - 23 y^{2} + 41 y + 120 - 2 y^{3} - y \cdot 23 - 6 (2 y^{2}) - 6 \cdot 23}{(2 y + 3) (2 y^{2} + 23) (y - 5)}$

Step 6.10.4

Multiply $23$ by $- 1$ .

$\frac{2 y^{3} - 23 y^{2} + 41 y + 120 - 2 y^{3} - 23 y - 6 (2 y^{2}) - 6 \cdot 23}{(2 y + 3) (2 y^{2} + 23) (y - 5)}$

Step 6.10.5

Multiply $2$ by $- 6$ .

$\frac{2 y^{3} - 23 y^{2} + 41 y + 120 - 2 y^{3} - 23 y - 12 y^{2} - 6 \cdot 23}{(2 y + 3) (2 y^{2} + 23) (y - 5)}$

Step 6.10.6

Multiply $- 6$ by $23$ .

$\frac{2 y^{3} - 23 y^{2} + 41 y + 120 - 2 y^{3} - 23 y - 12 y^{2} - 138}{(2 y + 3) (2 y^{2} + 23) (y - 5)}$

Step 6.11

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

$\frac{- 23 y^{2} + 41 y + 120 + 0 - 23 y - 12 y^{2} - 138}{(2 y + 3) (2 y^{2} + 23) (y - 5)}$

Step 6.12

Add $- 23 y^{2}$ and $0$ .

$\frac{- 23 y^{2} + 41 y + 120 - 23 y - 12 y^{2} - 138}{(2 y + 3) (2 y^{2} + 23) (y - 5)}$

Step 6.13

Subtract $12 y^{2}$ from $- 23 y^{2}$ .

$\frac{- 35 y^{2} + 41 y + 120 - 23 y - 138}{(2 y + 3) (2 y^{2} + 23) (y - 5)}$

Step 6.14

Subtract $23 y$ from $41 y$ .

$\frac{- 35 y^{2} + 18 y + 120 - 138}{(2 y + 3) (2 y^{2} + 23) (y - 5)}$

Step 6.15

Subtract $138$ from $120$ .

$\frac{- 35 y^{2} + 18 y - 18}{(2 y + 3) (2 y^{2} + 23) (y - 5)}$

Step 7

Simplify with factoring out.

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Step 7.1

Factor $- 1$ out of $- 35 y^{2}$ .

$\frac{- (35 y^{2}) + 18 y - 18}{(2 y + 3) (2 y^{2} + 23) (y - 5)}$

Step 7.2

Factor $- 1$ out of $18 y$ .

$\frac{- (35 y^{2}) - (- 18 y) - 18}{(2 y + 3) (2 y^{2} + 23) (y - 5)}$

Step 7.3

Factor $- 1$ out of $- (35 y^{2}) - (- 18 y)$ .

$\frac{- (35 y^{2} - 18 y) - 18}{(2 y + 3) (2 y^{2} + 23) (y - 5)}$

Step 7.4

Rewrite $- 18$ as $- 1 (18)$ .

$\frac{- (35 y^{2} - 18 y) - 1 (18)}{(2 y + 3) (2 y^{2} + 23) (y - 5)}$

Step 7.5

Factor $- 1$ out of $- (35 y^{2} - 18 y) - 1 (18)$ .

$\frac{- (35 y^{2} - 18 y + 18)}{(2 y + 3) (2 y^{2} + 23) (y - 5)}$

Step 7.6

Simplify the expression.

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Step 7.6.1

Rewrite $- (35 y^{2} - 18 y + 18)$ as $- 1 (35 y^{2} - 18 y + 18)$ .

$\frac{- 1 (35 y^{2} - 18 y + 18)}{(2 y + 3) (2 y^{2} + 23) (y - 5)}$

Step 7.6.2

Move the negative in front of the fraction.

$- \frac{35 y^{2} - 18 y + 18}{(2 y + 3) (2 y^{2} + 23) (y - 5)}$