Bonjour
Exercice 1
A = x^-6x+ 5 = (9)^2 -6(9) + 5 = 81 -54 + 5 = 32
A = (-4)^2 -6(-4) + 5 = 16 + 24 + 5 = 45
Exercice 2
A = 3x^2 -3x +4
B = -4x^2 -x
C = -3x + 5y -6
Exercice 3
A = 15 + 10x
B = -2x -14
C = 3x^2 + x + 6x + 2 = 3x^2 +7x +2
D = 4x + x^2 -28-7x = x^2 -3x -28
E = 4x -12x^2 -2 + 3x = -12x^2 + 7x -2