Posted by **Anonymous** on Monday, September 26, 2011 at 12:20pm.

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. If it is correct, supply any

missing steps or justification; If it is incorrect point out why.

€

(a + b)2 = [a + (−b)]2

= a2 + 2a(−b) + (−b)2

= a2 − 2ab + b2

Mathematical Connections 5‐3

2. a.

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