18n-81=n^2

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



18n-81=n^2

We move all terms to the left:

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

determiningTheFunctionDomain
-n^2+18n-81=0

We add all the numbers together, and all the variables

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

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