Question

1 ) (8x-4)(6+x)(2x-1)<0

2) (x+2)(5x+5)>0


3) ( 2+x)(5-2x)>=0

Merci !

Answer 1

1)
 (8x-4)(6+x)(2x-1)<0
48x+8x^2 - 24 - 4x ( 2x-1) < 0
44x+ 8x^2 - 24 (2x-1)<0
88x^2-44x+16x^3-8x^2-48x+24 <0
80x^2-92x+24+16x^3<0
20x^2-23x+6+4x^3<0

2)
(x+2)(5x+5)>0
5x^2+5x+10x+10>0
5x^2+15x+10>0
5x^2+15x>-10

3) 
(2+x)(5-2x)=0
10-4x+5x-2x^2=0
10+x-2x^2=0
x-2x^2=-10
-2x^2=-10-x
2x^2=10-x
x^2=5-x