Question

question
factor completely.
$9x^2 - 4$
answer attempt 1 out of 3

Explanation:

Step1: Recognize difference of squares

$9x^2 - 4 = (3x)^2 - (2)^2$

Step2: Apply difference of squares formula

Recall $a^2 - b^2 = (a-b)(a+b)$, so substitute $a=3x$, $b=2$:
$(3x - 2)(3x + 2)$

Answer:

$(3x - 2)(3x + 2)$