Bonjour
Soit f (x) = - 4x + 8
a. f (x) = - 4x + 8
f (- 3) = - 4 * - 3 + 8 = 12 + 8 = 20
b. - 4x + 8 = - 20
- 4x = - 20 - 8
- 4x = - 28
x = 28/4
x = 7
c. f (4) = - 4 * 4 + 8 = - 16 + 8 = - 8
d. - 4x + 8 = - 28
- 4x = - 28 - 8
- 4x = - 36
x = 36/4
x = 9.
