Q : 3      Find the following squares by using the identities.

            (i) (xy+3z)^2

Answers (1)

We use 
(a+b)^{2} = a^{2} + 2ab + b^{2}

In this a = xy and b = 3z
                         (xy+3z)^{2} = (xy)^{2} + 2(xy)(3z) + (3z)^{2}
                                                 =  x^{2}y^{2} + 6xyz+ 9z^{2}

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