5x2+4x+4/5=0

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Solution for 5x2+4x+4/5=0 equation: 



5x^2+4x+4/5=0

We multiply all the terms by the denominator


5x^2*5+4x*5+4=0

Wy multiply elements

25x^2+20x+4=0

a = 25; b = 20; c = +4;
Δ = b2-4ac
Δ = 202-4·25·4
Δ = 0
Delta is equal to zero, so there is only one solution to the equation

                              Stosujemy wzór:
$x=\frac{-b}{2a}=\frac{-20}{50}=-2/5$

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