0=-1000x^2+10000-9000

Solution for 0=-1000x^2+10000-9000 equation:

0=-1000x^2+10000-9000

We move all terms to the left:

0-(-1000x^2+10000-9000)=0

We add all the numbers together, and all the variables

-(-1000x^2+10000-9000)=0

We get rid of parentheses

1000x^2-10000+9000=0

We add all the numbers together, and all the variables

1000x^2-1000=0

a = 1000; b = 0; c = -1000;
Δ = b2-4ac
Δ = 02-4·1000·(-1000)
Δ = 4000000
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{4000000}=2000$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0)-2000}{2*1000}=\frac{-2000}{2000}
=-1
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+2000}{2*1000}=\frac{2000}{2000}
=1
$