x2+13,9x+3,4=0

Solution for x2+13,9x+3,4=0 equation:

x2+13.9x+3.4=0

We add all the numbers together, and all the variables

x^2+13.9x+3.4=0

a = 1; b = 13.9; c = +3.4;
Δ = b2-4ac
Δ = 13.92-4·1·3.4
Δ = 179.61
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(13.9)-\sqrt{179.61}}{2*1}=\frac{-13.9-\sqrt{179.61}}{2}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(13.9)+\sqrt{179.61}}{2*1}=\frac{-13.9+\sqrt{179.61}}{2}
$