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10 August, 22:52

Solve 3x2-11x-42=0 answer to problem

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  1. 10 August, 23:08
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    X1/2 = - b + - (root of) (b^2 - 4ac) / 2a

    a=3 b=-11 c=-42

    x1/2 = - (-11) + - (root of) 11^2 - 4*3 * (-42) / 2*3

    x1/2 = 11 + - (root of) 121 + 504 / 6

    x1/2 = 11 + - (root of) 625 / 6

    x1/2 = 11 + - 25 / 6

    x1 = 11+25/6 = 36/6 = 6

    x2 = 11-25 / 6 = 14:2/6:2 = 7/3
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