Q : 6      Using identities, evaluate.

           (vii) 78 \times 82

Answers (1)

This can be written in form of :

                                                   78\times82 = (80 - 2) \times(80+2)

or                                                                = 80^2 - 2^2                                                                 \because \left ( a-b \right )\left ( a+b \right ) = a^2 - b^2

or                                                                = 6400- 4 = 6396              

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