x^2=9(2x-9)

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Solution for x^2=9(2x-9) equation: 



x^2=9(2x-9)

We move all terms to the left:

x^2-(9(2x-9))=0



We calculate terms in parentheses: -(9(2x-9)), so:

9(2x-9)

We multiply parentheses

18x-81

Back to the equation:

-(18x-81)



We get rid of parentheses

x^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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