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

            (vi) (2a^2+9)(2a^2+5)

Answers (1)

We use identity  (x+a)(x+b)=x^2+(a+b)x+ab
In this a = 9 , b = 5 and x = 2a^{2}
                                             (2a^{2}+9)(2a^{2}+5) =  (2a^{2})^2+(9+5)2a^{2}+(9)(5)
                                                                                  = 4a^{4} + 28a^{2} + 45

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