Répondre :
Bonsoir,
F = (9x - 4)(x - 6)
F = 9x^2 - 54x - 4x + 24
F = 9x^2 - 58x + 24
Calculer F avec x = 1/2
F = 9 * (1/2)^2 - 58 * 1/2 + 24
F = 9 * 1/4 - 58/2 + 24
F = 9/4 - 29 + 24
F = 9/4 - 5
F = 9/4 - 20/4
F = -11/4
F = (9x - 4)(x - 6)
F = 9x^2 - 54x - 4x + 24
F = 9x^2 - 58x + 24
Calculer F avec x = 1/2
F = 9 * (1/2)^2 - 58 * 1/2 + 24
F = 9 * 1/4 - 58/2 + 24
F = 9/4 - 29 + 24
F = 9/4 - 5
F = 9/4 - 20/4
F = -11/4