Basic Math Examples

$\frac{- 5 y + 15}{y^{2} - 12 y + 30} \div \frac{2 y + 4}{2 y - 20}$

Step 1

To divide by a fraction, multiply by its reciprocal.

$\frac{- 5 y + 15}{y^{2} - 12 y + 30} \cdot \frac{2 y - 20}{2 y + 4}$

Step 2

Factor $5$ out of $- 5 y + 15$ .

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Step 2.1

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

$\frac{5 (- y) + 15}{y^{2} - 12 y + 30} \cdot \frac{2 y - 20}{2 y + 4}$

Step 2.2

Factor $5$ out of $15$ .

$\frac{5 (- y) + 5 (3)}{y^{2} - 12 y + 30} \cdot \frac{2 y - 20}{2 y + 4}$

Step 2.3

Factor $5$ out of $5 (- y) + 5 (3)$ .

$\frac{5 (- y + 3)}{y^{2} - 12 y + 30} \cdot \frac{2 y - 20}{2 y + 4}$

Step 3

Cancel the common factor of $2 y - 20$ and $2 y + 4$ .

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Step 3.1

Factor $2$ out of $2 y$ .

$\frac{5 (- y + 3)}{y^{2} - 12 y + 30} \cdot \frac{2 (y) - 20}{2 y + 4}$

Step 3.2

Factor $2$ out of $- 20$ .

$\frac{5 (- y + 3)}{y^{2} - 12 y + 30} \cdot \frac{2 (y) + 2 \cdot - 10}{2 y + 4}$

Step 3.3

Factor $2$ out of $2 (y) + 2 (- 10)$ .

$\frac{5 (- y + 3)}{y^{2} - 12 y + 30} \cdot \frac{2 (y - 10)}{2 y + 4}$

Step 3.4

Cancel the common factors.

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Step 3.4.1

Factor $2$ out of $2 y$ .

$\frac{5 (- y + 3)}{y^{2} - 12 y + 30} \cdot \frac{2 (y - 10)}{2 (y) + 4}$

Step 3.4.2

Factor $2$ out of $4$ .

$\frac{5 (- y + 3)}{y^{2} - 12 y + 30} \cdot \frac{2 (y - 10)}{2 y + 2 \cdot 2}$

Step 3.4.3

Factor $2$ out of $2 y + 2 \cdot 2$ .

$\frac{5 (- y + 3)}{y^{2} - 12 y + 30} \cdot \frac{2 (y - 10)}{2 (y + 2)}$

Step 3.4.4

Cancel the common factor.

$\frac{5 (- y + 3)}{y^{2} - 12 y + 30} \cdot \frac{2 (y - 10)}{2 (y + 2)}$

Step 3.4.5

Rewrite the expression.

$\frac{5 (- y + 3)}{y^{2} - 12 y + 30} \cdot \frac{y - 10}{y + 2}$

Step 4

Multiply $\frac{5 (- y + 3)}{y^{2} - 12 y + 30}$ by $\frac{y - 10}{y + 2}$ .

$\frac{5 (- y + 3) (y - 10)}{(y^{2} - 12 y + 30) (y + 2)}$

Step 5

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

$\frac{5 (- (y) + 3) (y - 10)}{(y^{2} - 12 y + 30) (y + 2)}$

Step 6

Rewrite $3$ as $- 1 (- 3)$ .

$\frac{5 (- (y) - 1 (- 3)) (y - 10)}{(y^{2} - 12 y + 30) (y + 2)}$

Step 7

Factor $- 1$ out of $- (y) - 1 (- 3)$ .

$\frac{5 (- (y - 3)) (y - 10)}{(y^{2} - 12 y + 30) (y + 2)}$

Step 8

Simplify the expression.

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Step 8.1

Rewrite $- (y - 3)$ as $- 1 (y - 3)$ .

$\frac{5 (- 1 (y - 3)) (y - 10)}{(y^{2} - 12 y + 30) (y + 2)}$

Step 8.2

Move the negative in front of the fraction.

$- \frac{(5 (y - 3)) (y - 10)}{(y^{2} - 12 y + 30) (y + 2)}$

Step 8.3

Reorder factors in $- \frac{(5 (y - 3)) (y - 10)}{(y^{2} - 12 y + 30) (y + 2)}$ .

$- \frac{5 (y - 3) (y - 10)}{(y^{2} - 12 y + 30) (y + 2)}$