Question

Hey guys, I need your help again!! This is confusing me.

Answer 1

$x^2-18x+81=(x-9)^2=(x-9)(x-9)$
So it's A.

Answer 2

(x - 9)(x + 9) is incorrect answer

Correct:
x^2 - 18x + 81
= (x - 9)^2
= (x - 9)(x - 9)

Answer
A. The answer is incorrect; the plus sign should be a minus sign.