X2+0.011x-0.00055=0

Solution for X2+0.011x-0.00055=0 equation:

X2+0.011X-0.00055=0

We add all the numbers together, and all the variables

X^2+0.011X-0.00055=0

a = 1; b = 0.011; c = -0.00055;
Δ = b2-4ac
Δ = 0.0112-4·1·(-0.00055)
Δ = 0.002321
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{-(0.011)-\sqrt{0.002321}}{2*1}=\frac{-0.011-\sqrt{0.002321}}{2}
$
$X_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0.011)+\sqrt{0.002321}}{2*1}=\frac{-0.011+\sqrt{0.002321}}{2}
$