x²-10x=0
x(x-10)=0
x₁=0
x₂=10
x²+6x=0
x(x+6)=0
x₁=0
x+6=0
x₂=-6
4x²+20x=0
4x(x+5)=0
x₁=0
x+5=0
x₂=-5
3x²-12x=0
3x(x-4)=0
x₁=0
x-4=0
x₂=4
2x²+x=0
x(2x+1)=0
x₁=02
x+1=0
2x=-1
x₂=-0.5
4x²-x=0
4x(x-0.25)=0
x₁=0
x-0.25=0
x₂=0.25
3x²-27=0
3(x²-9)=0
3(x-3)(x+3)=0
x-3=0
x₁=3
x+3=0
x₂=-3
2x²+3x-2=0
D=3²+4*2*2=25=5²
x₁=(-3-5)/4=-2
x₂=(-3+5)/4=0.5
3x²+8x-3=0
D=8²+4*3*3=100
x₁=(-8+10)/6=2/6=1/3
x₂=(-8-10)/6=-3
-x²+2x+8=0
x²-2x-8=0
D=4+4*8=36=6²
x₁=(2+6)/2=4
x₂=(2-6)/2=-2
-x²+7x-10=0
x²-7x+10=0
D=7²-4*10=9
x₁=(7-3)/2=2
x₂=(7+3)/2=5
9x²-6x+1=0
(3x)²-2*3x+1²=0
(3x-1)²=0
3x=1
x=1/3
4x²+4x+1=0
(2x+1)²=0
2x+1=02
x=-1
x=-0.5
-x²+7x+8=0
x²-7x-8=0
D=7²+4*8=81
x₁=(7-9)/2=-1
x₂=(7+9)/2=8
-x²-2x+15=0
x²+2x-15=0D=2²+4*15=64
x₁=(-2+8)/2=3
x₂=(-2-8)/2=-5
5x²-8x-4=0
D=8²+4*5*4=64+80=144
x₁=(8-12)/10=-0.4
x₂=(8+12)/10=2
6x²-7x+1=0
D=7²-4*6=25
x₁=(7-5)/6=1/3
x₂=(7+5)/6=2
5x²-8x+3=0
D=8²-4*3*5=4
x₁=(8-2)/10=0.6
x₂=(8+2)/10=1
7x²+9x+2=0
D=9²-4*7*2=25
x₁=(-9+5)/14=-2/7
x₂=(-9-5)/14=-1