2x(2x-18)=-81

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Solution for 2x(2x-18)=-81 equation: 



2x(2x-18)=-81

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We multiply parentheses

4x^2-36x+81=0

a = 4; b = -36; c = +81;
Δ = b2-4ac
Δ = -362-4·4·81
Δ = 0
Delta is equal to zero, so there is only one solution to the equation

                              Stosujemy wzór:
$x=\frac{-b}{2a}=\frac{36}{8}=4+1/2$

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