-c^2=9-6c

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



-c^2=9-6c

We move all terms to the left:

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

We add all the numbers together, and all the variables

-c^2-(-6c+9)=0

We add all the numbers together, and all the variables

-1c^2-(-6c+9)=0

We get rid of parentheses

-1c^2+6c-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:
$c=\frac{-b}{2a}=\frac{-6}{-2}=+3$

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