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16 October, 13:47

Given f (x) = (x - 3) (x + 7), what are the x-intercepts?

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  1. 16 October, 14:13
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    We can easily say the x intercepts are + 3 and - 7

    Or we can multiply (x-3) * (x+7)

    x^2 + 4x - 21 = 0

    a = 1 b = 4 c = - 21

    We solve with the quadratic equation

    x = 3

    x = - 7

    So that proves our answers are correct.
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