Développer
A= 8x²-12x-10x+15
A=8x²-22x+15
B=25x²-45x-45x+81-25x²+45
A=90x+126
C= -8x²+16x+14x-27+2x²-4x+9
C=-6x²+26x-18
D=-6x+3-(15x²-9x-20x+12)
D=-6x+3-15x²+9x+20x+12
D=-15x²+23x-9
L'inéquation
5x-3<7x+5
5x-7x<5+3
-2x <8
x<-8/2
x<-4 S=] - ∞ ; -4 [