-.02x^2+3040x-90,000,000=0

Solution for -.02x^2+3040x-90,000,000=0 equation:

-.02x^2+3040x-90.000.000=0

We add all the numbers together, and all the variables

-0.02x^2+3040x=0

a = -0.02; b = 3040; c = 0;
Δ = b2-4ac
Δ = 30402-4·(-0.02)·0
Δ = 9241600
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{9241600}=3040$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(3040)-3040}{2*-0.02}=\frac{-6080}{-0.04}
=+152000
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(3040)+3040}{2*-0.02}=\frac{0}{-0.04}
=0
$