Bonsoir,
Factoriser A :
A = (2x - 6)(x + 2) + 5(x + 2)
A = (x + 2)(2x - 6 + 5)
A = (x + 2)(2x - 1)
Calcule À pour x = 3 :
A = (3 + 2)(2 * 3 - 1)
A = 5 * (6 - 1)
A = 5 * 5
A = 25
Résous l’équation À = 0 :
(x + 2)(2x - 1) = 0
x + 2 = 0 ou 2x - 1 = 0
x = -2 ou 2x = 1
x = -2 ou x = 1/2
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Bonsoir,
Factoriser A :
A = (2x - 6)(x + 2) + 5(x + 2)
A = (x + 2)(2x - 6 + 5)
A = (x + 2)(2x - 1)
Calcule À pour x = 3 :
A = (3 + 2)(2 * 3 - 1)
A = 5 * (6 - 1)
A = 5 * 5
A = 25
Résous l’équation À = 0 :
(x + 2)(2x - 1) = 0
x + 2 = 0 ou 2x - 1 = 0
x = -2 ou 2x = 1
x = -2 ou x = 1/2