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4 January, 15:31

Solve 3x2 = - 12x - 15. x = - 4 ± 2i x = - 4 ± i x = - 2 ± 2i x = - 2 ± i

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  1. 4 January, 15:48
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    3x^2 = - 12x - 15

    3x^2 + 12x = - 15

    x^2 + 4x = - 5

    x^2 + 4x + 4 = - 5 + 4 = - 1

    (x + 2) ^2 = - 1

    x + 2 = + or - sqrt (-1) = + or - i

    x = - 2 + or - 1
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