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=-Y2-6Y-9
We move all terms to the left:
-(-Y2-6Y-9)=0
We add all the numbers together, and all the variables
-(-1Y^2-6Y-9)=0
We get rid of parentheses
1Y^2+6Y+9=0
We add all the numbers together, and all the variables
Y^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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