Question

question
factor completely.
121 - 81x²
answer attempt 1 out of 3

Explanation:

Step1: Recognize difference of squares

$121 - 81x^2 = 11^2 - (9x)^2$

Step2: Apply difference of squares formula

Use $a^2 - b^2 = (a-b)(a+b)$, where $a=11$, $b=9x$
$11^2 - (9x)^2 = (11 - 9x)(11 + 9x)$

Answer:

$(11 - 9x)(11 + 9x)$