x²=4 x=√4 x₁=2 x₂=-2
x²-9=0 x²=9 x=√9 x₁=3 x₂=-3
4x²=9 x²=9/4 x=√9/4 x₁=3/2 x₂=-3/2
25=x² x=√25 x₁=5 x₂=-5
16x²-9=0 x²=9/16 x=√9/16 x₁=3/4 x₂=-3/4
4x²=0 x=0
x²=2 x=√2
4x²=3 x=√3/4 x₁=(√3)/2 x₂=-(√3)/2
3x²=4 x=√4/3 x₁=2/√3 x₂=-2/√3
2x²=3 x=√3/2
3x²=0 x=0
1-2x²=0 2x²=1 x=√1/2
