Q : 6     Using identities, evaluate.

            (i) 71^2 

Answers (1)

We will use the identity:

                                                (a + b)^2 = a^2 + 2ab + b^2

   So,             71^2 = (70 +1)^2 = 70^2 + 2(70)(1) + 1^2

                                                        = 4900 + 140 + 1

                                                       = 5041

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