Question

Struggling with this question how do I explain someone help my out here ​

Answer 1

(a-b)^2 = a²-2ab+b²

Explanation:

(a-b)^2 is not a^2 - b^2.

(a-b)²= (a-b)(a-b)

= a(a-b)-b(a-b)

=a²-ab-ba+b²

=a²-ab-ab+b²

=a²-2ab+b²