25x^2+81=-90x

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



25x^2+81=-90x

We move all terms to the left:

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