Bonjour
Calculer pour x = 5
C = 3x² + 2x + 4
C = 3 * 5² + 2 * 5 + 4
C = 3 * 25 + 10 + 4
C = 75 + 14
C = 89
Calculer pour x = -3
F = -7x +5
F = - 7 * (- 3) + 5
F = 21 + 5
F = 26
F = 2x² - 4x - 2
F = 2 * (- 3)² - 4 * (- 3) - 2
F = 2 * 9 + 12 - 2
F = 18 + 10
F = 28
G = (5+4x) (7x-8)
G = (5 + 4 * (- 3)) (7 * (- 3) - 8)
G = (5 - 12) (- 21 - 8)
G = (- 7) * (- 29)
G = 203.
