Question: Prove that ab = 1/4 [(a + b) 2 (a b) 2 ] Given 70 2 = 4900 and 36 2 = 1296,

Prove that ab = 1/4 [(a + b)2 – (a – b)2] Given 702 = 4900 and 362 = 1296, calculate 53 × 17.

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