Fabrizio P.

asked • 12/16/20

How come sometimes (a+b)^2= a^2+b^2. While other times it equals (a+b)(a+b)

Kinda silly question probably, but I know sometimes

(a+b)2 = a2+b2. While other times (a+b)2 = (a+b)(a+b).

I had to make (x+3)2 = (x+3)(x+3). I started to wonder why it wouldn’t be x2 + 9 since when I look at the rules of exponents it almost always shows the a2 + b2 rule.

Hope this makes sense, but thanks in advance!

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