Y=x^2-18x+81

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Solution for Y=x^2-18x+81 equation: 



=Y^2-18Y+81

We move all terms to the left:

-(Y^2-18Y+81)=0

We get rid of parentheses

-Y^2+18Y-81=0

We add all the numbers together, and all the variables

-1Y^2+18Y-81=0

a = -1; b = 18; c = -81;
Δ = b2-4ac
Δ = 182-4·(-1)·(-81)
Δ = 0
Delta is equal to zero, so there is only one solution to the equation

                              Stosujemy wzór:
$Y=\frac{-b}{2a}=\frac{-18}{-2}=+9$

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