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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

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    He is correct.

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