Question

difference of perfect squares (level 2)
score: 2/3 penalty: none
question
factor completely.
answer attempt 1 out of 3
121 - x²

Explanation:

Step1: Identify perfect squares

$121 = 11^2$, $x^2 = x^2$

Step2: Apply difference of squares rule

The difference of squares formula is $a^2 - b^2 = (a-b)(a+b)$. Here $a=11$, $b=x$.
$121 - x^2 = 11^2 - x^2 = (11 - x)(11 + x)$

Answer:

$(11 - x)(11 + x)$