-y^2-6y=9

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Solution for -y^2-6y=9 equation: 



-y^2-6y=9

We move all terms to the left:

-y^2-6y-(9)=0

We add all the numbers together, and all the variables

-1y^2-6y-9=0

a = -1; b = -6; c = -9;
Δ = b2-4ac
Δ = -62-4·(-1)·(-9)
Δ = 0
Delta is equal to zero, so there is only one solution to the equation

                              Stosujemy wzór:
$y=\frac{-b}{2a}=\frac{6}{-2}=-3$

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