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8 May, 19:47

Write x2 + 4x - 2 in vertex form.

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  1. 8 May, 21:10
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    The vertex form: y = a (x - h) ² + k

    y = ax² + bx + c then h = - b/2a and k = f (h).

    y = x² + 4x - 2

    a = 1; b = 4; c = - 2

    h = - 4 / (2·1) = - 4/2 = - 2

    k = f (-2) = (-2) ² + 4· (-2) - 2 = 4 - 8 - 2 = - 6

    Answer: y = (x + 2) ² - 6.
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