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x^2+y^2=4
x^2+(2x+1)^2=4
x^2+4x^2+2x+1-4=0
3x^2+2x-3=0
Δ=2²+4*3*3=4+36=40
√Δ=2√10
x=1-√10
x=1+√10
x²+y²=4
x²+(2x+1)²=4
x²+4x²+4x+1=4
5x²+4x-3=0
Δ=b²-4ca=16+60=76
√Δ=2√19
x=(-b-√Δ):2a=(-4-2√19):10=-0,4-0,2√10=-0,2(2+√10)
x₂=(-b+√Δ):2a=(-4+2√19):10=-0,2(2-√10)
rozwiązaniem równań sa liczby:-0,2(2+√10) i -0,2(2-√10)