Basic Math Examples

$\frac{m^{2} - 7 m + 12}{2 m^{2} - 3 m - 2} \div \frac{3 m - 9}{- 10 m - 5}$

Step 1

To divide by a fraction, multiply by its reciprocal.

$\frac{m^{2} - 7 m + 12}{2 m^{2} - 3 m - 2} \cdot \frac{- 10 m - 5}{3 m - 9}$

Step 2

Factor $m^{2} - 7 m + 12$ using the AC method.

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Step 2.1

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 $12$ and whose sum is $- 7$ .

$- 4, - 3$

Step 2.2

Write the factored form using these integers.

$\frac{(m - 4) (m - 3)}{2 m^{2} - 3 m - 2} \cdot \frac{- 10 m - 5}{3 m - 9}$

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 $a \cdot c = 2 \cdot - 2 = - 4$ and whose sum is $b = - 3$ .

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Step 3.1.1

Factor $- 3$ out of $- 3 m$ .

$\frac{(m - 4) (m - 3)}{2 m^{2} - 3 (m) - 2} \cdot \frac{- 10 m - 5}{3 m - 9}$

Step 3.1.2

Rewrite $- 3$ as $1$ plus $- 4$

$\frac{(m - 4) (m - 3)}{2 m^{2} + (1 - 4) m - 2} \cdot \frac{- 10 m - 5}{3 m - 9}$

Step 3.1.3

Apply the distributive property.

$\frac{(m - 4) (m - 3)}{2 m^{2} + 1 m - 4 m - 2} \cdot \frac{- 10 m - 5}{3 m - 9}$

Step 3.1.4

Multiply $m$ by $1$ .

$\frac{(m - 4) (m - 3)}{2 m^{2} + m - 4 m - 2} \cdot \frac{- 10 m - 5}{3 m - 9}$

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.

$\frac{(m - 4) (m - 3)}{(2 m^{2} + m) - 4 m - 2} \cdot \frac{- 10 m - 5}{3 m - 9}$

Step 3.2.2

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

$\frac{(m - 4) (m - 3)}{m (2 m + 1) - 2 (2 m + 1)} \cdot \frac{- 10 m - 5}{3 m - 9}$

Step 3.3

Factor the polynomial by factoring out the greatest common factor, $2 m + 1$ .

$\frac{(m - 4) (m - 3)}{(2 m + 1) (m - 2)} \cdot \frac{- 10 m - 5}{3 m - 9}$

Step 4

Factor $5$ out of $- 10 m - 5$ .

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Step 4.1

Factor $5$ out of $- 10 m$ .

$\frac{(m - 4) (m - 3)}{(2 m + 1) (m - 2)} \cdot \frac{5 (- 2 m) - 5}{3 m - 9}$

Step 4.2

Factor $5$ out of $- 5$ .

$\frac{(m - 4) (m - 3)}{(2 m + 1) (m - 2)} \cdot \frac{5 (- 2 m) + 5 (- 1)}{3 m - 9}$

Step 4.3

Factor $5$ out of $5 (- 2 m) + 5 (- 1)$ .

$\frac{(m - 4) (m - 3)}{(2 m + 1) (m - 2)} \cdot \frac{5 (- 2 m - 1)}{3 m - 9}$

Step 5

Factor $3$ out of $3 m - 9$ .

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Step 5.1

Factor $3$ out of $3 m$ .

$\frac{(m - 4) (m - 3)}{(2 m + 1) (m - 2)} \cdot \frac{5 (- 2 m - 1)}{3 (m) - 9}$

Step 5.2

Factor $3$ out of $- 9$ .

$\frac{(m - 4) (m - 3)}{(2 m + 1) (m - 2)} \cdot \frac{5 (- 2 m - 1)}{3 m + 3 \cdot - 3}$

Step 5.3

Factor $3$ out of $3 m + 3 \cdot - 3$ .

$\frac{(m - 4) (m - 3)}{(2 m + 1) (m - 2)} \cdot \frac{5 (- 2 m - 1)}{3 (m - 3)}$

Step 6

Cancel the common factor of $m - 3$ .

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Step 6.1

Factor $m - 3$ out of $(m - 4) (m - 3)$ .

$\frac{(m - 3) (m - 4)}{(2 m + 1) (m - 2)} \cdot \frac{5 (- 2 m - 1)}{3 (m - 3)}$

Step 6.2

Factor $m - 3$ out of $3 (m - 3)$ .

$\frac{(m - 3) (m - 4)}{(2 m + 1) (m - 2)} \cdot \frac{5 (- 2 m - 1)}{(m - 3) \cdot 3}$

Step 6.3

Cancel the common factor.

$\frac{(m - 3) (m - 4)}{(2 m + 1) (m - 2)} \cdot \frac{5 (- 2 m - 1)}{(m - 3) \cdot 3}$

Step 6.4

Rewrite the expression.

$\frac{m - 4}{(2 m + 1) (m - 2)} \cdot \frac{5 (- 2 m - 1)}{3}$

Step 7

Multiply $\frac{m - 4}{(2 m + 1) (m - 2)}$ by $\frac{5 (- 2 m - 1)}{3}$ .

$\frac{(m - 4) (5 (- 2 m - 1))}{(2 m + 1) (m - 2) \cdot 3}$

Step 8

Cancel the common factor of $- 2 m - 1$ and $2 m + 1$ .

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Step 8.1

Factor $- 1$ out of $- 2 m$ .

$\frac{(m - 4) (5 (- (2 m) - 1))}{(2 m + 1) (m - 2) \cdot 3}$

Step 8.2

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

$\frac{(m - 4) (5 (- (2 m) - 1 (1)))}{(2 m + 1) (m - 2) \cdot 3}$

Step 8.3

Factor $- 1$ out of $- (2 m) - 1 (1)$ .

$\frac{(m - 4) (5 (- (2 m + 1)))}{(2 m + 1) (m - 2) \cdot 3}$

Step 8.4

Rewrite $- (2 m + 1)$ as $- 1 (2 m + 1)$ .

$\frac{(m - 4) (5 (- 1 (2 m + 1)))}{(2 m + 1) (m - 2) \cdot 3}$

Step 8.5

Cancel the common factor.

$\frac{(m - 4) \cdot 5 (- 1 (2 m + 1))}{(2 m + 1) (m - 2) \cdot 3}$

Step 8.6

Rewrite the expression.

$\frac{(m - 4) \cdot 5 \cdot (- 1)}{(m - 2) \cdot 3}$

Step 9

Simplify the expression.

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Step 9.1

Multiply $- 1$ by $5$ .

$\frac{(m - 4) \cdot - 5}{(m - 2) \cdot 3}$

Step 9.2

Move $- 5$ to the left of $m - 4$ .

$\frac{- 5 \cdot (m - 4)}{(m - 2) \cdot 3}$

Step 9.3

Move $3$ to the left of $m - 2$ .

$\frac{- 5 \cdot (m - 4)}{3 \cdot (m - 2)}$

Step 9.4

Move the negative in front of the fraction.

$- \frac{5 (m - 4)}{3 (m - 2)}$