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Math Help - help with this polynomial

  1. #1
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    help with this polynomial

    Hi;

    got this question
    Given that
    x -2 is a factor of the polynomial x^3 - kx^2 -24x + 28, find k.

    I get k=-3 they get k=3.

    Pretty sure I'm right just need confirmation.

    Thanks.
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  2. #2
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    Re: help with this polynomial

    confirm it yourself ...

    f(x) = x^3 + 3x^2 - 24x + 28 if k = -3

    or

    f(x) = x^3 - 3x^2 - 24x + 28 if k = 3

    which one yields f(2) = 0 ?
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  3. #3
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    Re: help with this polynomial

    Got it thanks Skeeter its the top one.
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