0=x2+6x+9

Solution for 0=x2+6x+9 equation:

0=x2+6x+9

We move all terms to the left:

0-(x2+6x+9)=0

We add all the numbers together, and all the variables

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

We add all the numbers together, and all the variables

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

We get rid of parentheses

-x^2-6x-9=0

We add all the numbers together, and all the variables

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