y(y+4)=-4

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Solution for y(y+4)=-4 equation: 



y(y+4)=-4

We move all terms to the left:

y(y+4)-(-4)=0

We add all the numbers together, and all the variables

y(y+4)+4=0

We multiply parentheses

y^2+4y+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:
$y=\frac{-b}{2a}=\frac{-4}{2}=-2$

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