Réponse:
exercice 2
b(x) = -12x-18
c(x) = x² -5x +3x -15 = x²-2x-15
d(x) = x+3-x+5 = 8
e (x) = 2x +8 -15x +25 = -13x +33
f(x) = 9x² +2*3x*2 + 4= 9x² +12x +4
g(x) = -5x+15 -(12x² +6x -4x-2)
g(x) = -5x+15 -(12x² +2x -2)
g(x) = -5x+15 -12x² -2x +2= -12x² -7x +17
exercice 3
à(x) = 7x(x-2)
b(x) = 4ab(1+2ab²)
c(x) = (x+5) (2x+3+3x-5)= (x+5) (5x-2)
d(x) = (x-1) (5x+15-3x+1) = (x-1) (2x+16) =2(x-1) (x+8)
e**(x) = 4(4x²+4x+1) -6x-3 = 16x²+16x+4-6x-3=16x²+10x+1 = 2x(8x +5) +1
