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

Sagot :

Panoyin
        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
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