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Question
Evaluate the following, using suitable identity
472
Solution
472 = (50 – 3)2
Taking a = 50 and b = 3
(a – b)2 = a2 – 2ab + b2 becomes
(50 – 3)2 = 502 – 2(50)(3) + 32
= 2500 – 300 + 9
= 2200 + 9
472 = 2209
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