Factor 5y^2-125

$5 y^{2} - 125$

Step 1

Factor $5$ out of $5 y^{2} - 125$ .

Factor $5$ out of $5 y^{2}$ .

$5 (y^{2}) - 125$

Factor $5$ out of $- 125$ .

$5 y^{2} + 5 \cdot - 25$

Factor $5$ out of $5 y^{2} + 5 \cdot - 25$ .

$5 (y^{2} - 25)$

Step 2

Rewrite $25$ as $5^{2}$ .

$5 (y^{2} - 5^{2})$

Step 3

Factor.

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 $b = 5$ .

$5 ((y + 5) (y - 5))$

Remove unnecessary parentheses.

$5 (y + 5) (y - 5)$