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x2=-6x-9
We move all terms to the left:
x2-(-6x-9)=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
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
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