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6 February, 00:18

Which of the following is a solution of x^2 + 4x = - 8?

x = - 2 - 2i

x = 2 + 2i

x = - 4 + 4i

x = 4 - 4i

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Answers (1)
  1. 6 February, 00:42
    0
    X²+4x+8=0

    use the quadratic formula: (sorry cannot type it here)

    √ (b²-4ac) = √ (4²-4*1*8) = √ (16-32) = √ (-16) = + / - 4i

    x = (-4+4i) / 2 or (-4-4i) / 2

    x=-2+2i or x=-2-2i

    the answer is A
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