Q : 2      Use the identity  (x+a) (x+b) = x^2+(a+b)x+ab   to find the following products.

              (i) (x+3)(x+7)

Answers (1)

We use identity (x+a) (x+b) = x^2+(a+b)x+ab
 in this a = 3 and b = 7
                                  (x+3)(x+7) = x^2+(3+7)x+3 \times 7
                                                                 = x^2+10x+ 21

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