bonjour
1) f(-1) = - 7*-1 + 65
f(-1) = 7 + 65
f(-1) = 72
2) g(x) = 5x² - 3 x + 2
g(1) = 5*1² -3*1 + 2
g ( 1) = 5 - 3 + 2
g(1) = 4
f(2) = -7*2 + 65
f(2) = - 14 + 65
f(2) = 51
g(2) = 5*2² - 3 *2 + 2
g(2) = 20 - 6 + 2
g(2) = 14 + 2
g(2) = 16
3) f(x) = 8
- 7x + 65 = 8
- 7x = -57
x = -57/-7
x = 57/7
4)
f(x) = 65
- 7x + 65 = 65
-7x = 0
x = 0
bonne continuation