4X²-3X=0
x(4x-3)=0
x=0或x=3/4
4X²-25=0
x²=25/4
x=5/2或-5/2
9X²+12X+4=0
(3x+2)²=0
x1=x2=-2/3
15X²+6=X+8
15x²-x-2=0
(3x+1)(5x-2)=0
x=-1/3或x=2/5
4X²-3X=0
x(4x-3)=0
x=0或x=3/4
4X²-25=0
x²=25/4
x=5/2或-5/2
9X²+12X+4=0
(3x+2)²=0
x1=x2=-2/3
15X²+6=X+8
15x²-x-2=0
(3x+1)(5x-2)=0
x=-1/3或x=2/5