Explications étape par étape:
EXERCICE 1:
1)4x-5=7x+8
4x-7x=8+5
-3x=13
x=-13/3
2)-8x+17=3x-5
3x+8x=17+5
11x=22
x=2
3)-6x-25=-12x-5
-6x+12x=-5+25
6x=20
x=10/3
4)13x+9=-x+11
14x=2
x=1/7
EXERCICE 2:
(2x-3)²=(x+1)(4x-10)
4x²-12x+9=4x²-10x+4x-10
4x²-4x²+10x-12x+4x+9-10=0
2x-1=0
x=1/2
(3x+4)(3x-4)=(6x+1)²-(27x²+12x-17)
9x²-16=36x²+12x+1-27x²-12x+17
9x²-36x²+27x²-12x+12x-16-17-1=0
-24=0
(n'admet aucune solution)
