math
posted by jeana .
Kahlil said that using the equation (a + b)2 = a2 + 2ab + b2, he can find a similar equation for (a  b)2. Examine his argument.
(a  b)2 = [a + (b)]2
= a2 + 2a(b) + (b)2
= a2 – 2ab + b2

He is correct.
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