Help ! J’ai besoin d’aide pour l’exercice 53 p. 106 svp!

Bonjour,

a) Pour x = 4

(3x + 1) (6 - x)

= (3 * 4 + 1) (6 - 4)

= (12 + 1) (2)

= 13 * 2

= 26

b) Pour x = - 2

(3x + 1) (6 - x)

= (3 * - 2 + 1) (6 - (- 2))

= (- 6 + 1) (6 + 2)

= - 5 * 8

= - 40

c) Pour x = 5/6

(3x + 1) (6 - x)

= (3 * 5/6 + 1) (6 - 5/6)

= (15/6 + 6/6) (36/6 - 5/6)

= 21/6 * 31/6

= 651/36

= (3 * 217) / (3 * 12)

= 217/12.