Bonsoir,
1) x = réponse
y = x² - 9
2) 2² - 9 = 4 - 9 = -5
3) 5² - 9 = 25 - 9 = 16
4) (-4)² - 9 = 16 - 9 = 7
5) x² - 9 = 0
x² - 3² = 0
(x-3)(x + 3) = 0
Vrai si A * B = 0 si A = 0 ou B = 0
Donc :
x - 3 = 0
x = 3
Et
x + 3 = 0
x = -3
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Bonsoir,
1) x = réponse
y = x² - 9
2) 2² - 9 = 4 - 9 = -5
3) 5² - 9 = 25 - 9 = 16
4) (-4)² - 9 = 16 - 9 = 7
5) x² - 9 = 0
x² - 3² = 0
(x-3)(x + 3) = 0
Vrai si A * B = 0 si A = 0 ou B = 0
Donc :
x - 3 = 0
x = 3
Et
x + 3 = 0
x = -3