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25 February, 17:21

What is the sum of the roots of the polynomial shown below?

f (x) = x2 + 2x2 - 117 - 12

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Answers (1)
  1. 25 February, 21:06
    0
    x^3 + 2*x^2 - 11*x - 12 = 0 = >

    => x^3 + 2*x^2 - 11*x - 12 = 0

    => (x - 3) * (x + 4) * (x + 1) = 0

    the roots are 3,-4,-1

    I just add them,

    3 + (-4) + (-1) = -2
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