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# Find the following squares by using the identities. (ii) (xy+3z)^2

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

(i) $(xy+3z)^2$

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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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