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10 July, 10:02

What are the real roots of 2x^3+9x^2+4x-15=0

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  1. 10 July, 12:14
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    Well, luckily it is apparent that (x-1) is a root because when x=1 the equation is equal to zero. So we can divide the equation by that factor to find the other roots.

    (2x^3+9x^2+4x-15) / (x-1)

    2x^2 r 11x^2+4x-15

    11x r 15x-15

    15 r 0

    (x-1) (2x^2+11x+15) = 0

    (x-1) (2x^2+6x+5x+15) = 0

    (x-1) (2x (x+3) + 5 (x+3)) = 0

    (x-1) (2x+5) (x+3) = 0

    So the roots are x = - 3, - 2.5, 1
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