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What is the coefficient of xy in the expansion of  (3x + (4y + 1))^2?

 Oct 7, 2020
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= 9x^2 + 12xy + 3x + 12xy + 16y^2 + 4y + 3x + 4y + 1     Gather 'like' terms.......

 Oct 7, 2020

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