Algebra Examples

$f (x) = \frac{2 x^{2}}{x^{2} - 1}$

Step 1

Factor $x^{2} - 1$ .

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Step 1.1

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

$f (x) = \frac{2 x^{2}}{x^{2} - 1^{2}}$

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 $a = x$ and $b = 1$ .

$f (x) = \frac{2 x^{2}}{(x + 1) (x - 1)}$

Step 2

Since no factors can be removed from the denominator, there are no holes in the graph.

No holes

Step 3