-z^2+2z=1

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Solution for -z^2+2z=1 equation: 



-z^2+2z=1

We move all terms to the left:

-z^2+2z-(1)=0

We add all the numbers together, and all the variables

-1z^2+2z-1=0

a = -1; b = 2; c = -1;
Δ = b2-4ac
Δ = 22-4·(-1)·(-1)
Δ = 0
Delta is equal to zero, so there is only one solution to the equation

                              Stosujemy wzór:
$z=\frac{-b}{2a}=\frac{-2}{-2}=1$

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