1.

397 x 397 + 104 x 104 + 2 x 397 x 104 = ?

Answer» Given Exp. = (397)2 + (104)2 + 2 x 397 x 104 = (397 + 104)2 = (501)2 = (500 + 1)2 = (5002) + (1)2 + (2 x 500 x 1) = 250000 + 1 + 1000 = 251001


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