90x=81+25x^2

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Solution for 90x=81+25x^2 equation: 



90x=81+25x^2

We move all terms to the left:

90x-(81+25x^2)=0

We get rid of parentheses

-25x^2+90x-81=0

a = -25; b = 90; c = -81;
Δ = b2-4ac
Δ = 902-4·(-25)·(-81)
Δ = 0
Delta is equal to zero, so there is only one solution to the equation

                              Stosujemy wzór:
$x=\frac{-b}{2a}=\frac{-90}{-50}=1+4/5$

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