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Sagot :

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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