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How do you multiply #( x + 3)^2#?

1 Answer

Jul 2, 2015

#=color(blue)(x^2 + 6x+ 9#

Explanation:

#(x+3)^2#

This expression is of the form of the identity:

#color(blue)((a+b))^2 = a^2 +2ab +b^2#

So,
#color(blue)((x+3)^2) = x^2 + 2 . x . 3 + 3^2#

#=color(blue)(x^2 + 6x+ 9#

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