Factor 49-y^2

$49 - y^{2}$

Step 1

Rewrite $49$ as $7^{2}$ .

$7^{2} - y^{2}$

Step 2

Since both terms are perfect squares, factor using the difference of squares formula, $a^{2} - b^{2} = (a + b) (a - b)$ where $a = 7$ and $b = y$ .

$(7 + y) (7 - y)$