bonjour
a)(3x+8)(2x-1)=0
3x+8=0 3x=-8 x=-8/3
2x-1=0 2x=1 x=1/3
b)(3x+8)((2x-1)=-8
6x²+16x-3x-8=-8
6x²+13x-8=-8
6x²-13x-8+8=0
6x²-13x=0
x(6x+13)=0
x=0
6x+13=0 6x=-13 x=-13/6
c) (3x+8)(2x-1)=-11x-32
6x²+16x-3x-8=-11x-32
6x²+13x-8=-11x-32
6x²+13x-8+11x+32=0
6x²+24x+24=0
6(x²+4x+4)=0
x²+4x+4 =0
(x+2)²=0
x+2=0 x=-2
solutions
-8/3 1/2 0 -13/6 -2
-8/3+1/2-13/6-2=
-8/3=-8x2/3x2=-16/6
1/2=1x3/2x3=3/6
2=-12/6
-16/6+3/6-13/6-12/6= -38/6
-38/6= -(2x19)/2x3=-19/3
