solve for x: 2xsquared+4x-16=0

Question

01-06-2015
Mathematics

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solve for x: 2xsquared+4x-16=0

Answer :

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Panoyin Panoyin · Answer 1 · 2015-06-01T18:45:25-04:00

      2x² + 4x - 16 = 0
2(x²) + 2(2x) - 2(8) = 0
      2(x² + 2x - 8) = 0
      2    2
   x² + 2x - 8 = 0
      x = -(2) ± √((2)² - 4(1)(-8))
   2(1)
      x = -2 ± √(4 + 32)
   2
      x = -2 ± √(36)
   2
    x = -2 ± 6
    2
x = -1 ± 3
      x = -1 + 3 U x = -1 - 3
      x = 2 x = -4