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March 30, 2017

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how do you solve 2x^2+x^3=96?

  • Math - ,

    x^3 + 2x^2 - 96 = 0
    tried x = 1,2,3,4 and x=4 worked
    by synthetic division
    x^3 + 2x^2 - 96 = 0
    (x-4)(x^2 + 6x + 24) = 0

    solving x^2 + 6x + 9 = -24 + 9
    (x+3)^2 = -15
    x = +3 ± √15 i

    x = 4 , 3 ± √15 i

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