EXERCICE 5 Factoriser les expressions suivantes comme dans l'exemple : A = 13(x + 2) + 5(x + 2) B = 7(2x - 3) + 2(2x - 3) Z = (x + 1905 + 3) = B(x + 1) C = 3x(x

Réponse :

A = 13(x + 2) + 5(x + 2)

A = (x + 2)(13 + 5)

A = 18(x + 2)

B = 7(2x - 3) + 2(2x - 3)

B = (2x - 3)(7 + 2)

B = 9(2x - 3)

C = 3x(x + 2) - 5(x + 2)

C = (x + 2)(3x - 5)

D = 4(x + 3) + 9x(x + 3)

D = (x + 3)(4 + 9x)

E = 7x(3x + 1) - 10x(3x + 1)

E = (3x + 1)(7x - 10x)

E = -3(3x + 1)