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(a + 1) × (a + 2) =

 Apr 15, 2016
 #1
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= a^2 + 2a + 1a + 2 = a^2 + 3a + 2

 Apr 15, 2016
 #2
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(a+1)(a+2)=(a)(a+2)+1(a+2)=(a)(a)+2a+a+2=a2+3a+2

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 Apr 17, 2016

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