x^2-100x-720000=0

Solution for x^2-100x-720000=0 equation:

x^2-100x-720000=0

a = 1; b = -100; c = -720000;
Δ = b2-4ac
Δ = -1002-4·1·(-720000)
Δ = 2890000
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{2890000}=1700$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-100)-1700}{2*1}=\frac{-1600}{2}
=-800
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-100)+1700}{2*1}=\frac{1800}{2}
=900
$