Integrated Math 1

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What is the coefficient of the xy^2 term in the expansion of (3x + y)^3? Use the binomial theorem.

  • Integrated Math 1 -

    In this case it is just as easy to simply expand it

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

    so we want the second last term which is
    9xy^2

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