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