Q2 of 59 Page 263

Evaluate the following by using suitable identities:

83 × 77

Given:83×77 = (80 + 3)(80-3)

= (80)2-(3)2,where a = 80 and b = 3 in identity (a + b)(a-b) = a2-b2


= 6400-9 = 6391


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