-2x^2-18x-81=-x2

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Solution for -2x^2-18x-81=-x2 equation: 



-2x^2-18x-81=-x2

We move all terms to the left:

-2x^2-18x-81-(-x2)=0

We add all the numbers together, and all the variables

-2x^2-(-1x^2)-18x-81=0

We get rid of parentheses

-2x^2+1x^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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