Q : 6        Using identities, evaluate.

               (ii) 99^2

Answers (1)

Here we will use the identity :

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

So :                         99^2 = (100 - 1) ^2 = 100^2 - 2(100)(1) + 1^2

 or                                                                 = 10000 - 200 + 1

                                                                      = 9801

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