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Question
Evaluate using the expansion of (a + b)2 or (a – b)2 :
(20.7)2
Sum
Solution
(20.7)2 = (20 + 0.7)2
= (20)2 + (0.7)2 + 2 (20) (0.7)
= 400 + 0.49 + 28
= 428 + 0.49
= 428.49
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