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x²+2y-4=0
x=2y
(2y)²+2y-4=0
x=2y
4y²+2y-4=0/:2
x=2y
2y²+y-2=0
2y²+y-2=0
Δ=1-4·2·(-2)=17
√Δ=√17
y₁=(-1-√17)/4
y₂=(-1+√17)/4
x=2y
y=(-1-√17)/4 v y=(-1+√17)/4
x=-2(-1-√17)/4=(-1-√17)/2
y=(-1-√17)/4
lub
x=(-1+√17)/2
y=(-1+√17)/4