Using identities, evaluate 712
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Solution
712 = (70 + 1)2
= (70)2 + 2(70) (1) + (1)2 [(a + b)2 = a2 + 2ab + b2 ]
= 4900 + 140 + 1 = 5041
Concept: Expansion of (a + b)2 = a2 + 2ab + b2
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