-.0005x^2+45x-1000000=0

Solution for -.0005x^2+45x-1000000=0 equation:

-.0005x^2+45x-1000000=0

We add all the numbers together, and all the variables

-0.0005x^2+45x-1000000=0

a = -0.0005; b = 45; c = -1000000;
Δ = b2-4ac
Δ = 452-4·(-0.0005)·(-1000000)
Δ = 25
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{25}=5$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(45)-5}{2*-0.0005}=\frac{-50}{-0.001}
=+50000
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(45)+5}{2*-0.0005}=\frac{-40}{-0.001}
=+40000
$