Algebra Examples

$y^{2} - 100$

Step 1

Rewrite $100$ as $10^{2}$ .

$y^{2} - 10^{2}$

Step 2

Since both terms are perfect squares, factor using the difference of squares formula, $a^{2} - b^{2} = (a + b) (a - b)$ where $a = y$ and $b = 10$ .

$(y + 10) (y - 10)$