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18 December, 23:26

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

A. 4 + i√7

B. - 1 + i√7

C. 2 + i√7

D. - 4 + i√7

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Answers (1)
  1. 18 December, 23:50
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    X^2 + 2x + 8 = 0

    (x + 1) ^2 - 1 + 8 = 0

    (x + 1) ^2 = - 7

    x + 1 = sqrt (-7) = i sqrt7

    x = - 1 + i sqrt7

    Its B
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