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27 October, 07:41

Find the x-intercepts for the parabola defined by the equation below. y = 3x2 + 18x + 15

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  1. 27 October, 07:58
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    Using quadratic formula

    x = [-18 + - sq root (324 - 4 * 3*15) ] / 2*3

    x = [-18 + - sq root (144) ]/6

    x1 = (-18 + 12) / 6 = - 1

    x2 = (-18 - 12) / 6 = - 30/6 = - 5
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