Answer:
(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
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