Basic Math Examples

$\frac{{(2 a + 3 b)}^{2}}{3 a - 5 b} \cdot \frac{9 a^{2} - 25 b^{2}}{4 a^{2} - 9 b^{2}} \div \frac{3 a + 5 b}{2 a - 3 b}$

Step 1

To divide by a fraction, multiply by its reciprocal.

$\frac{{(2 a + 3 b)}^{2}}{3 a - 5 b} \cdot \frac{9 a^{2} - 25 b^{2}}{4 a^{2} - 9 b^{2}} \frac{2 a - 3 b}{3 a + 5 b}$

Step 2

Simplify the numerator.

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Step 2.1

Rewrite $9 a^{2}$ as ${(3 a)}^{2}$ .

$\frac{{(2 a + 3 b)}^{2}}{3 a - 5 b} \cdot \frac{{(3 a)}^{2} - 25 b^{2}}{4 a^{2} - 9 b^{2}} \frac{2 a - 3 b}{3 a + 5 b}$

Step 2.2

Rewrite $25 b^{2}$ as ${(5 b)}^{2}$ .

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

Step 2.3

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

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

Step 2.4

Multiply $5$ by $- 1$ .

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

Step 3

Simplify the denominator.

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Step 3.1

Rewrite $4 a^{2}$ as ${(2 a)}^{2}$ .

$\frac{{(2 a + 3 b)}^{2}}{3 a - 5 b} \cdot \frac{(3 a + 5 b) (3 a - 5 b)}{{(2 a)}^{2} - 9 b^{2}} \frac{2 a - 3 b}{3 a + 5 b}$

Step 3.2

Rewrite $9 b^{2}$ as ${(3 b)}^{2}$ .

$\frac{{(2 a + 3 b)}^{2}}{3 a - 5 b} \cdot \frac{(3 a + 5 b) (3 a - 5 b)}{{(2 a)}^{2} - {(3 b)}^{2}} \frac{2 a - 3 b}{3 a + 5 b}$

Step 3.3

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

$\frac{{(2 a + 3 b)}^{2}}{3 a - 5 b} \cdot \frac{(3 a + 5 b) (3 a - 5 b)}{(2 a + 3 b) (2 a - (3 b))} \frac{2 a - 3 b}{3 a + 5 b}$

Step 3.4

Multiply $3$ by $- 1$ .

$\frac{{(2 a + 3 b)}^{2}}{3 a - 5 b} \cdot \frac{(3 a + 5 b) (3 a - 5 b)}{(2 a + 3 b) (2 a - 3 b)} \frac{2 a - 3 b}{3 a + 5 b}$

Step 4

Simplify terms.

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Step 4.1

Cancel the common factor of $2 a + 3 b$ .

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Step 4.1.1

Factor $2 a + 3 b$ out of ${(2 a + 3 b)}^{2}$ .

$\frac{(2 a + 3 b) (2 a + 3 b)}{3 a - 5 b} \cdot \frac{(3 a + 5 b) (3 a - 5 b)}{(2 a + 3 b) (2 a - 3 b)} \frac{2 a - 3 b}{3 a + 5 b}$

Step 4.1.2

Cancel the common factor.

$\frac{(2 a + 3 b) (2 a + 3 b)}{3 a - 5 b} \cdot \frac{(3 a + 5 b) (3 a - 5 b)}{(2 a + 3 b) (2 a - 3 b)} \frac{2 a - 3 b}{3 a + 5 b}$

Step 4.1.3

Rewrite the expression.

$\frac{2 a + 3 b}{3 a - 5 b} \cdot \frac{(3 a + 5 b) (3 a - 5 b)}{2 a - 3 b} \frac{2 a - 3 b}{3 a + 5 b}$

Step 4.2

Cancel the common factor of $3 a - 5 b$ .

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Step 4.2.1

Factor $3 a - 5 b$ out of $(3 a + 5 b) (3 a - 5 b)$ .

$\frac{2 a + 3 b}{3 a - 5 b} \cdot \frac{(3 a - 5 b) (3 a + 5 b)}{2 a - 3 b} \frac{2 a - 3 b}{3 a + 5 b}$

Step 4.2.2

Cancel the common factor.

$\frac{2 a + 3 b}{3 a - 5 b} \cdot \frac{(3 a - 5 b) (3 a + 5 b)}{2 a - 3 b} \frac{2 a - 3 b}{3 a + 5 b}$

Step 4.2.3

Rewrite the expression.

$(2 a + 3 b) \cdot \frac{3 a + 5 b}{2 a - 3 b} \frac{2 a - 3 b}{3 a + 5 b}$

Step 4.3

Multiply $2 a + 3 b$ by $\frac{3 a + 5 b}{2 a - 3 b}$ .

$\frac{(2 a + 3 b) (3 a + 5 b)}{2 a - 3 b} \cdot \frac{2 a - 3 b}{3 a + 5 b}$

Step 4.4

Cancel the common factor of $3 a + 5 b$ .

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Step 4.4.1

Factor $3 a + 5 b$ out of $(2 a + 3 b) (3 a + 5 b)$ .

$\frac{(3 a + 5 b) (2 a + 3 b)}{2 a - 3 b} \cdot \frac{2 a - 3 b}{3 a + 5 b}$

Step 4.4.2

Cancel the common factor.

$\frac{(3 a + 5 b) (2 a + 3 b)}{2 a - 3 b} \cdot \frac{2 a - 3 b}{3 a + 5 b}$

Step 4.4.3

Rewrite the expression.

$\frac{2 a + 3 b}{2 a - 3 b} (2 a - 3 b)$

Step 4.5

Cancel the common factor of $2 a - 3 b$ .

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Step 4.5.1

Cancel the common factor.

$\frac{2 a + 3 b}{2 a - 3 b} (2 a - 3 b)$

Step 4.5.2

Rewrite the expression.

$2 a + 3 b$