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[tex] x^{2} +16x=-28[/tex]

Sagot :

        x² + 16x = -28
x² + 16x + 28 = 0
x = -(16) +/- √((16)² - 4(1)(28))
                       2(1)
x = -16 +/- √(256 - 112)
                     2
x = -16 +/- √(144)
                2
x = -16 +/- 12
              2
x = -8 + 6
x = -8 + 6    x = -8 - 6
x = -2          x = -14