evaluate the following by using suitable identity 799^2 – InterviewSolution

InterviewSolution

1.

evaluate the following by using suitable identity 799^2

Answer»

(799)^2 = (800-1)^2 Using identity (a-b)^2 = a^2 + b^2 - 2ab

(800-1)^2 = (800)^2 +(1)^2 - 2*800*1 = 640000 + 1 - 1600 = 638400 + 1 = 638401

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