Question

factor completely.
$49s^2 - 64$

Explanation:

Step1: Recognize difference of squares

$49s^2 = (7s)^2$, $64 = 8^2$

Step2: Apply difference of squares formula

Use $a^2 - b^2 = (a-b)(a+b)$ with $a=7s$, $b=8$

Answer:

$(7s - 8)(7s + 8)$