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

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Answer 1 · 2015-07-02T13:15:20

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

$(x+3)^2$

This expression is of the form of the identity:

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

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

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

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