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What is the solution of X2-9x+18=0

Sagot :

x² - 9x + 18 = 0
x = -(-9) +/- √((-9)² - 4(1)(18))
                     2(1)
x = 9 +/- √(81 - 72)
                 2
x = 9 +/- √(9)
            2
x = 9 +/- 3
           2
x = 4.5 + 1.5
x = 4.5 + 1.5      x = 4.5 - 1.5
x = 6                  x = 3