Trigonometry Examples

$\frac{y^{2} - 16}{y^{2}} \cdot \frac{y^{2} - 4 x}{x^{2} + 2 x - 24}$

Step 1

Simplify the numerator.

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Step 1.1

Rewrite $16$ as $4^{2}$ .

$\frac{y^{2} - 4^{2}}{y^{2}} \cdot \frac{y^{2} - 4 x}{x^{2} + 2 x - 24}$

Step 1.2

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

$\frac{(y + 4) (y - 4)}{y^{2}} \cdot \frac{y^{2} - 4 x}{x^{2} + 2 x - 24}$

Step 2

Factor $x^{2} + 2 x - 24$ 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 $- 24$ and whose sum is $2$ .

$- 4, 6$

Step 2.2

Write the factored form using these integers.

$\frac{(y + 4) (y - 4)}{y^{2}} \cdot \frac{y^{2} - 4 x}{(x - 4) (x + 6)}$

Step 3

Multiply $\frac{(y + 4) (y - 4)}{y^{2}}$ by $\frac{y^{2} - 4 x}{(x - 4) (x + 6)}$ .

$\frac{(y + 4) (y - 4) (y^{2} - 4 x)}{y^{2} (x - 4) (x + 6)}$