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You have to multiply variable to each other. Then after you multiply, add the same variables. Then poof. You have your answer. :)
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I'll just give you an example

(a+5)^2              f: a.a= a^2
(a+5) (a+5)        o: a.5= 5a
a^2+5a+5a+25   i: 5.a= 5a
a^2-6a-9            l: 5.5= 25
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