0=0.057x-0.001x^2

Solution for 0=0.057x-0.001x^2 equation:

0=0.057x-0.001x^2

We move all terms to the left:

0-(0.057x-0.001x^2)=0

We add all the numbers together, and all the variables

-(0.057x-0.001x^2)=0

We get rid of parentheses

0.001x^2-0.057x=0

a = 0.001; b = -0.057; c = 0;
Δ = b2-4ac
Δ = -0.0572-4·0.001·0
Δ = 0.003249
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{-(-0.057)-\sqrt{0.003249}}{2*0.001}=\frac{0.057-\sqrt{0.003249}}{0.002}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-0.057)+\sqrt{0.003249}}{2*0.001}=\frac{0.057+\sqrt{0.003249}}{0.002}
$