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What is the coefficient of xy in the expansion of (3x + (2y + 1))*(3x - (2y - 1))?

 Sep 3, 2021
 #1
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The coefficient of xy is -4.

 Sep 3, 2021
 #2
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This term would be

C(2,1)*(3x)^1 *(2y + 1)^1  =

2(3x)(2y + 1) =

6x(2y + 1) =

12xy + 6x

So....the coefficient is 12

 Sep 3, 2021

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