-81=x^2-18x

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



-81=x^2-18x

We move all terms to the left:

-81-(x^2-18x)=0

We get rid of parentheses

-x^2+18x-81=0

We add all the numbers together, and all the variables

-1x^2+18x-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:
$x=\frac{-b}{2a}=\frac{-18}{-2}=+9$

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