Question

evaluate using expansion of (a+b) or (a-b) ² 1=(208)²

Answer 1

208 = 200+8
(200+8)^2 = 200^2 + 8^2 + 2(200)(8) 40,000+64+3200=43264
(by the identity (a+b)^2 = a^2 + b^2 + 2ab)