Liczba jest rozwiązaniem równania
x2+4=0x^2+4=0x2+4=0x^2+4=0
x+22=1\displaystyle \frac{x+2}{2}=1 2x+2=1\displaystyle \frac{x+2}{2}=1
xx+2=0\displaystyle \frac{x}{x+2} =0x+2x=0\displaystyle \frac{x}{x+2} =0
x2(x+2)+2(x+2)=0x^2\left(x+2\right)+2\left(x+2\right)=0x2(x+2)+2(x+2)=0x^2\left(x+2\right)+2\left(x+2\right)=0
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