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[tex] x^{2} +18x+79=0[/tex]

Sagot :

x² + 18x + 79 = 0
x = -(18) +/- √((18)² - 4(1)(79))
                       2(1)
x = -18 +/- √(324 - 316)
                     2
x = -18 +/- √(8)
              2
x = -18 +/- 2√(2)
               2
x = -9 + √(2)
x = -9 + √(2)      x = -9 - √(2)