lomas

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Right answer?

15(x^2+3x) + 7(x^2+3x) - 5(x^2+3x)

15x^2+45x+7x^2+21x + 5(-x^2-3x)

15x^2+45x+7x^2+21x-5x^2-15x

17x^2+51x

  • lomas -

    x^2 + 3x is common to all terms. So we
    factor it out:
    (x^2 + 3x) (15 + 7 - 5),
    (x^2 + 3x)17,
    17(x^2 + 3x).

    Factor your answer and it wil be identical to mine.

    Alternate method:
    Let (x^2 + 3x) = a,
    15a + 7a - 5a = 17a,
    17(x^2 + 3x).

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