0.81x^2+1.8x+1=0

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Solution for 0.81x^2+1.8x+1=0 equation: 



0.81x^2+1.8x+1=0

a = 0.81; b = 1.8; c = +1;
Δ = b2-4ac
Δ = 1.82-4·0.81·1
Δ = 0
Delta is equal to zero, so there is only one solution to the equation

                              Stosujemy wzór:
$x=\frac{-b}{2a}=\frac{-1.8}{1.62}=-1+0.18/1.62$

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