Basic Math Examples

$\frac{4 y^{2} - 13 y + 3}{2 y^{2} - 5 y - 12} \div \frac{2 y^{2} + 9 y + 9}{16 y^{2} - 1} \div \frac{y^{2} + 3 y - 28}{y^{2 - 9}}$

Step 1

To divide by a fraction, multiply by its reciprocal.

$\frac{4 y^{2} - 13 y + 3}{2 y^{2} - 5 y - 12} \div \frac{2 y^{2} + 9 y + 9}{16 y^{2} - 1} \cdot \frac{y^{2 - 9}}{y^{2} + 3 y - 28}$

Step 2

To divide by a fraction, multiply by its reciprocal.

$\frac{4 y^{2} - 13 y + 3}{2 y^{2} - 5 y - 12} \cdot \frac{16 y^{2} - 1}{2 y^{2} + 9 y + 9} \frac{y^{2 - 9}}{y^{2} + 3 y - 28}$

Step 3

Factor by grouping.

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Step 3.1

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 $a \cdot c = 4 \cdot 3 = 12$ and whose sum is $b = - 13$ .

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Step 3.1.1

Factor $- 13$ out of $- 13 y$ .

$\frac{4 y^{2} - 13 (y) + 3}{2 y^{2} - 5 y - 12} \cdot \frac{16 y^{2} - 1}{2 y^{2} + 9 y + 9} \frac{y^{2 - 9}}{y^{2} + 3 y - 28}$

Step 3.1.2

Rewrite $- 13$ as $- 1$ plus $- 12$

$\frac{4 y^{2} + (- 1 - 12) y + 3}{2 y^{2} - 5 y - 12} \cdot \frac{16 y^{2} - 1}{2 y^{2} + 9 y + 9} \frac{y^{2 - 9}}{y^{2} + 3 y - 28}$

Step 3.1.3

Apply the distributive property.

$\frac{4 y^{2} - 1 y - 12 y + 3}{2 y^{2} - 5 y - 12} \cdot \frac{16 y^{2} - 1}{2 y^{2} + 9 y + 9} \frac{y^{2 - 9}}{y^{2} + 3 y - 28}$

Step 3.2

Factor out the greatest common factor from each group.

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Step 3.2.1

Group the first two terms and the last two terms.

$\frac{(4 y^{2} - 1 y) - 12 y + 3}{2 y^{2} - 5 y - 12} \cdot \frac{16 y^{2} - 1}{2 y^{2} + 9 y + 9} \frac{y^{2 - 9}}{y^{2} + 3 y - 28}$

Step 3.2.2

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

$\frac{y (4 y - 1) - 3 (4 y - 1)}{2 y^{2} - 5 y - 12} \cdot \frac{16 y^{2} - 1}{2 y^{2} + 9 y + 9} \frac{y^{2 - 9}}{y^{2} + 3 y - 28}$

Step 3.3

Factor the polynomial by factoring out the greatest common factor, $4 y - 1$ .

$\frac{(4 y - 1) (y - 3)}{2 y^{2} - 5 y - 12} \cdot \frac{16 y^{2} - 1}{2 y^{2} + 9 y + 9} \frac{y^{2 - 9}}{y^{2} + 3 y - 28}$

Step 4

Factor by grouping.

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Step 4.1

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 $a \cdot c = 2 \cdot - 12 = - 24$ and whose sum is $b = - 5$ .

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Step 4.1.1

Factor $- 5$ out of $- 5 y$ .

$\frac{(4 y - 1) (y - 3)}{2 y^{2} - 5 (y) - 12} \cdot \frac{16 y^{2} - 1}{2 y^{2} + 9 y + 9} \frac{y^{2 - 9}}{y^{2} + 3 y - 28}$

Step 4.1.2

Rewrite $- 5$ as $3$ plus $- 8$

$\frac{(4 y - 1) (y - 3)}{2 y^{2} + (3 - 8) y - 12} \cdot \frac{16 y^{2} - 1}{2 y^{2} + 9 y + 9} \frac{y^{2 - 9}}{y^{2} + 3 y - 28}$

Step 4.1.3

Apply the distributive property.

$\frac{(4 y - 1) (y - 3)}{2 y^{2} + 3 y - 8 y - 12} \cdot \frac{16 y^{2} - 1}{2 y^{2} + 9 y + 9} \frac{y^{2 - 9}}{y^{2} + 3 y - 28}$

Step 4.2

Factor out the greatest common factor from each group.

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Step 4.2.1

Group the first two terms and the last two terms.

$\frac{(4 y - 1) (y - 3)}{(2 y^{2} + 3 y) - 8 y - 12} \cdot \frac{16 y^{2} - 1}{2 y^{2} + 9 y + 9} \frac{y^{2 - 9}}{y^{2} + 3 y - 28}$

Step 4.2.2

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

$\frac{(4 y - 1) (y - 3)}{y (2 y + 3) - 4 (2 y + 3)} \cdot \frac{16 y^{2} - 1}{2 y^{2} + 9 y + 9} \frac{y^{2 - 9}}{y^{2} + 3 y - 28}$

Step 4.3

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

$\frac{(4 y - 1) (y - 3)}{(2 y + 3) (y - 4)} \cdot \frac{16 y^{2} - 1}{2 y^{2} + 9 y + 9} \frac{y^{2 - 9}}{y^{2} + 3 y - 28}$

Step 5

Simplify the numerator.

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Step 5.1

Rewrite $16 y^{2}$ as ${(4 y)}^{2}$ .

$\frac{(4 y - 1) (y - 3)}{(2 y + 3) (y - 4)} \cdot \frac{{(4 y)}^{2} - 1}{2 y^{2} + 9 y + 9} \frac{y^{2 - 9}}{y^{2} + 3 y - 28}$

Step 5.2

Rewrite $1$ as $1^{2}$ .

$\frac{(4 y - 1) (y - 3)}{(2 y + 3) (y - 4)} \cdot \frac{{(4 y)}^{2} - 1^{2}}{2 y^{2} + 9 y + 9} \frac{y^{2 - 9}}{y^{2} + 3 y - 28}$

Step 5.3

Since both terms are perfect squares, factor using the difference of squares formula, $a^{2} - b^{2} = (a + b) (a - b)$ where $a = 4 y$ and $b = 1$ .

$\frac{(4 y - 1) (y - 3)}{(2 y + 3) (y - 4)} \cdot \frac{(4 y + 1) (4 y - 1)}{2 y^{2} + 9 y + 9} \frac{y^{2 - 9}}{y^{2} + 3 y - 28}$

Step 6

Factor by grouping.

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Step 6.1

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 $a \cdot c = 2 \cdot 9 = 18$ and whose sum is $b = 9$ .

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Step 6.1.1

Factor $9$ out of $9 y$ .

$\frac{(4 y - 1) (y - 3)}{(2 y + 3) (y - 4)} \cdot \frac{(4 y + 1) (4 y - 1)}{2 y^{2} + 9 (y) + 9} \frac{y^{2 - 9}}{y^{2} + 3 y - 28}$

Step 6.1.2

Rewrite $9$ as $3$ plus $6$

$\frac{(4 y - 1) (y - 3)}{(2 y + 3) (y - 4)} \cdot \frac{(4 y + 1) (4 y - 1)}{2 y^{2} + (3 + 6) y + 9} \frac{y^{2 - 9}}{y^{2} + 3 y - 28}$

Step 6.1.3

Apply the distributive property.

$\frac{(4 y - 1) (y - 3)}{(2 y + 3) (y - 4)} \cdot \frac{(4 y + 1) (4 y - 1)}{2 y^{2} + 3 y + 6 y + 9} \frac{y^{2 - 9}}{y^{2} + 3 y - 28}$

Step 6.2

Factor out the greatest common factor from each group.

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Step 6.2.1

Group the first two terms and the last two terms.

$\frac{(4 y - 1) (y - 3)}{(2 y + 3) (y - 4)} \cdot \frac{(4 y + 1) (4 y - 1)}{(2 y^{2} + 3 y) + 6 y + 9} \frac{y^{2 - 9}}{y^{2} + 3 y - 28}$

Step 6.2.2

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

$\frac{(4 y - 1) (y - 3)}{(2 y + 3) (y - 4)} \cdot \frac{(4 y + 1) (4 y - 1)}{y (2 y + 3) + 3 (2 y + 3)} \frac{y^{2 - 9}}{y^{2} + 3 y - 28}$

Step 6.3

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

$\frac{(4 y - 1) (y - 3)}{(2 y + 3) (y - 4)} \cdot \frac{(4 y + 1) (4 y - 1)}{(2 y + 3) (y + 3)} \frac{y^{2 - 9}}{y^{2} + 3 y - 28}$

Step 7

Multiply $\frac{(4 y - 1) (y - 3)}{(2 y + 3) (y - 4)} \cdot \frac{(4 y + 1) (4 y - 1)}{(2 y + 3) (y + 3)}$ .

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Step 7.1

Multiply $\frac{(4 y - 1) (y - 3)}{(2 y + 3) (y - 4)}$ by $\frac{(4 y + 1) (4 y - 1)}{(2 y + 3) (y + 3)}$ .

$\frac{(4 y - 1) (y - 3) ((4 y + 1) (4 y - 1))}{(2 y + 3) (y - 4) ((2 y + 3) (y + 3))} \cdot \frac{y^{2 - 9}}{y^{2} + 3 y - 28}$

Step 7.2

Raise $4 y - 1$ to the power of $1$ .

$\frac{{(4 y - 1)}^{1} (4 y - 1) (y - 3) (4 y + 1)}{(2 y + 3) (y - 4) ((2 y + 3) (y + 3))} \cdot \frac{y^{2 - 9}}{y^{2} + 3 y - 28}$

Step 7.3

Raise $4 y - 1$ to the power of $1$ .

$\frac{{(4 y - 1)}^{1} {(4 y - 1)}^{1} (y - 3) (4 y + 1)}{(2 y + 3) (y - 4) ((2 y + 3) (y + 3))} \cdot \frac{y^{2 - 9}}{y^{2} + 3 y - 28}$

Step 7.4

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

$\frac{{(4 y - 1)}^{1 + 1} (y - 3) (4 y + 1)}{(2 y + 3) (y - 4) ((2 y + 3) (y + 3))} \cdot \frac{y^{2 - 9}}{y^{2} + 3 y - 28}$

Step 7.5

Add $1$ and $1$ .

$\frac{{(4 y - 1)}^{2} (y - 3) (4 y + 1)}{(2 y + 3) (y - 4) ((2 y + 3) (y + 3))} \cdot \frac{y^{2 - 9}}{y^{2} + 3 y - 28}$

Step 7.6

Raise $2 y + 3$ to the power of $1$ .

$\frac{{(4 y - 1)}^{2} (y - 3) (4 y + 1)}{{(2 y + 3)}^{1} (2 y + 3) (y - 4) (y + 3)} \cdot \frac{y^{2 - 9}}{y^{2} + 3 y - 28}$

Step 7.7

Raise $2 y + 3$ to the power of $1$ .

$\frac{{(4 y - 1)}^{2} (y - 3) (4 y + 1)}{{(2 y + 3)}^{1} {(2 y + 3)}^{1} (y - 4) (y + 3)} \cdot \frac{y^{2 - 9}}{y^{2} + 3 y - 28}$

Step 7.8

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

$\frac{{(4 y - 1)}^{2} (y - 3) (4 y + 1)}{{(2 y + 3)}^{1 + 1} (y - 4) (y + 3)} \cdot \frac{y^{2 - 9}}{y^{2} + 3 y - 28}$

Step 7.9

Add $1$ and $1$ .

$\frac{{(4 y - 1)}^{2} (y - 3) (4 y + 1)}{{(2 y + 3)}^{2} (y - 4) (y + 3)} \cdot \frac{y^{2 - 9}}{y^{2} + 3 y - 28}$

Step 8

Combine fractions.

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Step 8.1

Move $y^{2 - 9}$ to the denominator using the negative exponent rule $b^{- n} = \frac{1}{b^{n}}$ .

$\frac{{(4 y - 1)}^{2} (y - 3) (4 y + 1)}{{(2 y + 3)}^{2} (y - 4) (y + 3)} \cdot \frac{1}{(y^{2} + 3 y - 28) y^{- (2 - 9)}}$

Step 8.2

Combine.

$\frac{{(4 y - 1)}^{2} (y - 3) (4 y + 1) \cdot 1}{{(2 y + 3)}^{2} (y - 4) (y + 3) ((y^{2} + 3 y - 28) y^{- (2 - 9)})}$

Step 8.3

Multiply ${(4 y - 1)}^{2}$ by $1$ .

$\frac{{(4 y - 1)}^{2} (y - 3) (4 y + 1)}{{(2 y + 3)}^{2} (y - 4) (y + 3) ((y^{2} + 3 y - 28) y^{- (2 - 9)})}$

Step 9

Simplify the denominator.

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Step 9.1

Factor $y^{2} + 3 y - 28$ using the AC method.

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Step 9.1.1

Consider the form $x^{2} + b x + c$ . Find a pair of integers whose product is $c$ and whose sum is $b$ . In this case, whose product is $- 28$ and whose sum is $3$ .

$- 4, 7$

Step 9.1.2

Write the factored form using these integers.

$\frac{{(4 y - 1)}^{2} (y - 3) (4 y + 1)}{{(2 y + 3)}^{2} (y - 4) (y + 3) ((y - 4) (y + 7)) y^{- (2 - 9)}}$

$\frac{{(4 y - 1)}^{2} (y - 3) (4 y + 1)}{{(2 y + 3)}^{2} (y - 4) (y + 3) (y - 4) (y + 7) y^{- (2 - 9)}}$

Step 9.2

Combine exponents.

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Step 9.2.1

Raise $y - 4$ to the power of $1$ .

$\frac{{(4 y - 1)}^{2} (y - 3) (4 y + 1)}{{(2 y + 3)}^{2} ({(y - 4)}^{1} (y - 4)) (y + 3) (y + 7) y^{- (2 - 9)}}$

Step 9.2.2

Raise $y - 4$ to the power of $1$ .

$\frac{{(4 y - 1)}^{2} (y - 3) (4 y + 1)}{{(2 y + 3)}^{2} ({(y - 4)}^{1} {(y - 4)}^{1}) (y + 3) (y + 7) y^{- (2 - 9)}}$

Step 9.2.3

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

$\frac{{(4 y - 1)}^{2} (y - 3) (4 y + 1)}{{(2 y + 3)}^{2} {(y - 4)}^{1 + 1} (y + 3) (y + 7) y^{- (2 - 9)}}$

Step 9.2.4

Add $1$ and $1$ .

$\frac{{(4 y - 1)}^{2} (y - 3) (4 y + 1)}{{(2 y + 3)}^{2} {(y - 4)}^{2} (y + 3) (y + 7) y^{- (2 - 9)}}$

Step 9.3

Subtract $9$ from $2$ .

$\frac{{(4 y - 1)}^{2} (y - 3) (4 y + 1)}{{(2 y + 3)}^{2} {(y - 4)}^{2} (y + 3) (y + 7) y^{- - 7}}$

Step 9.4

Multiply $- 1$ by $- 7$ .

$\frac{{(4 y - 1)}^{2} (y - 3) (4 y + 1)}{{(2 y + 3)}^{2} {(y - 4)}^{2} (y + 3) (y + 7) y^{7}}$

Step 10

Reorder factors in $\frac{{(4 y - 1)}^{2} (y - 3) (4 y + 1)}{{(2 y + 3)}^{2} {(y - 4)}^{2} (y + 3) (y + 7) y^{7}}$ .

$\frac{{(4 y - 1)}^{2} (y - 3) (4 y + 1)}{y^{7} {(2 y + 3)}^{2} {(y - 4)}^{2} (y + 3) (y + 7)}$