Exercice 2 Factoriser les expressions suivantes : 1. F= x2 - 3x 2. G=-3t2 - 18t 3. H= (5a - 2)(3a + 1) - 6a - 2 4. I = 16t2 + 4t 5. J = 21b2 - 14b

Réponse :Bonjour,

1. F = x² - 3x

= x(x- 3)

2. G = -3t² - 18t

=t(-3t - 18)

=-3t(t+ 6)

3. H = (5a -2)(3a+1) - 2(3a+1)

H = (3a+1) (5a-2-2)

= (3a+1) (5a- 4)

4. I = 4t(4t+1)

5. J = 21b² - 14b

= b (21b - 14)

= 7b(3b - 2)