Q : 1   Use a suitable identity to get each of the following products in bracket. 

         (v) (1.1m - 4)(1.1m+4)

Answers (1)

(1.1m - 4)(1.1m+4)
We use identity III for this which is 
                                                    (a - b)(a + b) =  a^{2} - b^{2}
In this a = 1.1m  and b = 4
                                           (1.1m - 4)(1.1m+4) =  (1.1m)^{2} - (4)^{2}
                                                                                           =  1.21m^{2} - 16       

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