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9 March, 00:25

Solve for x

15x^2+16x = - 4

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Answers (1)
  1. 9 March, 01:23
    0
    15x²+16x+4 = 0 (ax² + bx + c=0)

    Δ = b²-4ac = 256 - 4*15*4 = 16

    x1 = (-b+√Δ) / 2a = (-16+√16) / 30 = (-16+4) / 30 = - 12/30 = - 2/5

    x2 = (-b - √Δ) / 2a = (-16 - √16) / 30 = (-16 - 4) / 30 = - 20/30 = - 2/3
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