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PLEASE HELP! How do you count (a+2) (b+1) ??
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PLEASE HELP! How do you count (a+2) (b+1) ??

User Marlun
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(a+2)(b+1)=(a)(b)+(a)(1)+(2)(b)+(2)(1)\\\\=ab+a+2b+2

User Idsbllp
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