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14 December, 12:24

Solve x2 + 4x - 4 = 8 for x. A) = - 12 or x = 2 B) x = - 11 or x = 1 C) x = - 2 or x = 12 D) x = - 1 or x = 11

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  1. 14 December, 12:35
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    Hello:

    x² + 4x - 4 = 8

    x²+4x - 12 = 0

    (x²+2 (2) (x) + 2²) - 2² - 12 = 0

    (x+2) ² - 16 = 0

    (x+2) ² = 4²

    x+2 = 4 or x+2 = - 4

    x=2 or x = - 6
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