-20x=x^2

Solution for -20x=x^2 equation:

-20x=x^2

We move all terms to the left:

-20x-(x^2)=0

determiningTheFunctionDomain
-x^2-20x=0

We add all the numbers together, and all the variables

-1x^2-20x=0

a = -1; b = -20; c = 0;
Δ = b2-4ac
Δ = -202-4·(-1)·0
Δ = 400
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{400}=20$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-20)-20}{2*-1}=\frac{0}{-2}
=0
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-20)+20}{2*-1}=\frac{40}{-2}
=-20
$