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8 August, 05:56

Which equation has the solutions x = 1 + V5?

A) x^2 + 2 х + 4 = 0

B) x^2 - 2 х + 4 = 0

C) х^2 + 2 х - 4 = 0

D) x^2 - 2 х - 4 = 0

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Answers (1)
  1. 8 August, 07:08
    0
    x^2-2x-4=0

    Δ=2^2-4*1 * (-4)

    Δ=4+16=20

    VΔ=2V5

    x1 = (2+2V5) / 2=1+V5

    the answer is D
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