Bonjour,

Ex. 44 :

a) 48 + 8x = 8×6 + 8×x = 8 × (6 + x)

b) 63y - 35 = 7×9y + 7×5 = 7 × (9y + 5)

tu essayes de faire les deux derniers ?

Ex. 45 :

a) 6x² - 5x = x×6x - x×5 = x × (6x - 5)

b) 49y² + 14y = 7y×7y + 7y×2 = 7y × (7y + 2)

tu essayes de faire les deux derniers ?

Réponse :

44

a. 48 + 8x = 8*6 + 8*x = 8(6 + x)

b. 63y - 35 = 7*9y - 7*5 = 7(9y - 5)

c. 15 a + 20 = 5*3a + 5*4 = 5(3a + 4)

d. -2 - 4t = -2*1 -2*2t = -2(1 + 2t)

45

a. 6x² - 5x = 6x*x - 5*x = (6x - 5)x

b. 49y² + 14 y = 7y*7y + 7y*2 = 7y(7y + 2)

c. 9n² - 6n = 3n*3n - 2*3n = 3n(3n -2)

d. 8t² + 6t + 2 = 2*4t² + 2*3t + 2*1 = 2(4t² + 3t + 1)