z2+4z=-4

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Solution for z2+4z=-4 equation: 



z2+4z=-4

We move all terms to the left:

z2+4z-(-4)=0

We add all the numbers together, and all the variables

z^2+4z+4=0

a = 1; b = 4; c = +4;
Δ = b2-4ac
Δ = 42-4·1·4
Δ = 0
Delta is equal to zero, so there is only one solution to the equation

                              Stosujemy wzór:
$z=\frac{-b}{2a}=\frac{-4}{2}=-2$

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