Question

factoring day 1
score: 38/48 answered: 19/24
question 20
factor completely:
$x^2 - 4 = $
question help: video

Explanation:

Step1: Recognize difference of squares

The expression $x^2 - 4$ is a difference of squares, since $4=2^2$, fitting the form $a^2 - b^2$.

Step2: Apply difference of squares formula

Use the identity $a^2 - b^2=(a+b)(a-b)$, where $a=x$ and $b=2$.
$x^2 - 2^2=(x+2)(x-2)$

Answer:

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