Bonjour
a. Pour x = 0
A = (x + 4) (3x - 8) - (x + 4) (x + 2)
A = (0 + 4) (3 * 0 - 8) - (0 + 4) (0 + 2)
A = 4 * (- 8) - 4 * 2
A = - 32 - 8
A = - 40
Pour x = 1
A = (x + 4) (3x - 8) - (x + 4) (x + 2)
A = (1 + 4) (3 * 1 - 8) - (1 + 4) (1 + 2)
A = 5 * (3 - 8) - 5 * 3
A = 5 * (- 5) - 15
A = - 25 - 15
A = - 40
b. Pour x = 0
A = (x + 4) (2x - 6)
A = (0 + 4) (2 * 0 - 6)
A = 4 * (- 6)
A = - 24
Pour x = 1
A = (x + 4) (2x - 6)
A = (1 + 4) (2 * 1 - 6)
A = 4 * (2 - 6)
A = 4 * (- 4)
A = - 16.
