81+25x2+90x=0

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Solution for 81+25x2+90x=0 equation: 



81+25x^2+90x=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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