Bonjour
On considère l'expression A = (x + 3)² - 4.
1. Factoriser A.
A = (x + 3)² - 4.
A = (x + 3 - 2) (x + 3 + 2)
A = (x + 1) (x + 5)
2. Résoudre l'équation A = 0.
(x + 1) (x + 5) = 0
x + 1 = 0 ou x + 5 = 0
x = - 1 x = - 5.
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Bonjour
On considère l'expression A = (x + 3)² - 4.
1. Factoriser A.
A = (x + 3)² - 4.
A = (x + 3 - 2) (x + 3 + 2)
A = (x + 1) (x + 5)
2. Résoudre l'équation A = 0.
(x + 1) (x + 5) = 0
x + 1 = 0 ou x + 5 = 0
x = - 1 x = - 5.