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Math Help - Finding x of this polynomial

  1. #1
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    Finding x of this polynomial

    Looking for the x of this polynomial

    x^3 + 3x^2 - 40 = 0

    I tried using the factor theorem but i cant find the value that makes it 0. f( ) = 0

    x should = 2.66
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  2. #2
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    It doesn't factorise, so you'll have to use a numerical method, like the bisection method or Newton's method.
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