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5x²=-2
√5x=√-2
x=-(√10/5)
(2x-1)(x+2)=3
2x²+4x-x-2=3
2x²+3x=5
2x²+3x-5=0
Δ=3²-4*2*(-10)=9+80=89
√Δ=√89
x₁=(-3-√89)/2*2=(-3-√89)/4
x₂=(-3+√89)/2*2=(-3-√89)/4