Finite Math Examples

$\frac{\frac{1 - x}{1 + x}}{\frac{9 x}{x^{2} - 1}}$

Step 1

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

$\frac{\frac{1 - x}{1 + x}}{\frac{9 x}{x^{2} - 1^{2}}}$

Step 2

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

$\frac{\frac{1 - x}{1 + x}}{\frac{9 x}{(x + 1) (x - 1)}}$