Question

x²+2x=0 3x²-6x-2=0 4x²+4x-1=-10-8x

Answer 1

x²+2x=0

x(x+2)=0

x=0

x+2=0 x=-2

3x²-6x-2=0

3x²-6x+1=3

（3x-1）²=3

3x-1=根号下3

x=（根号下3-1）/3

4x²+4x-1=-10-8x

4x²+4x-1+10+8x=0

4x²+12x+9=0

(2x+3)²=0

2x+3=0 x=-1.5