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algebra

posted by .

I don't even know where to begin with this problem.

multiply
(2y+5w+6)(5y+5w-4)

  • algebra -

    Use the same pattern as you use in FOIL

    (2y+5w+6)(5y+5w-4)
    = 2y(5y) + 2y(5w) + 2y(-4) + 5w(5y) + ...
    = 10y^2 + 10wy - 8y ...

    combine all like terms

  • algebra -

    ok I finished the problem. Is this right?

    2y(5y)+ 2y(5w) + 2y(-4) + 5w(5y) + 5w(5w)+ 5w(-4) + 6(5y) + 6(5w) + 6(-4)

    then I multiplied:
    10y^2 + 10wy - 8y + 25wy + 25w^2 - 20w + 30y + 30w - 24

    then I combined like terms:
    10y^2 + 15wy + 25w^2 + 22y + 10w - 24

    final answer:
    10y^2 + 25w^2 + 15wy + 22y + 10w-24

  • algebra -

    15wy should have been 35wy

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