3√37 x^2=0
x₁=x₂=0
(x+3,1)·(x-7)=0
x²-7x+3,1x-21,7=0
x²-3,9x-21,7=0
Δ=b²-4ac
Δ=(3,9)²-4·1·(-21,7)=15,21+86,8=102,01
x₁=(3,9-10,1)/2=-6,2/2=-3,1
x₂=(3,9+10,1)/2=14/2=7
x^2+2,8x=0
x(x+2,8)=0
x₁=0
x₂=-2,8
-x^2+49=0
-x²=-49 (-1)
x²=49
x₁=√49=7
x₂=-7
2x^2+32=0
2(x²+16)=0
x²+16=0
x₁=√-16=4i
x₂=-4i
6x^2+11x-7=0
Δ=121+168=289
x₁=(-11+Δ289)/12
x₂=(-11-√289)/12