Bonjour,
x² - 7x + 9 = 9
x² - 7x + 9 - 9 = 0
x² - 7x = 0
x (x - 7) =0
x = 0 et x - 7 = 0
x = 7
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Bonjour,
x² - 7x + 9 = 9
x² - 7x + 9 - 9 = 0
x² - 7x = 0
x (x - 7) =0
x = 0 et x - 7 = 0
x = 7