X^2-2x-7200=0

Solution for X^2-2x-7200=0 equation:

X^2-2X-7200=0

a = 1; b = -2; c = -7200;
Δ = b2-4ac
Δ = -22-4·1·(-7200)
Δ = 28804
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$X_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$X_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

The end solution:

$\sqrt{\Delta}=\sqrt{28804}=\sqrt{4*7201}=\sqrt{4}*\sqrt{7201}=2\sqrt{7201}$
$X_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-2)-2\sqrt{7201}}{2*1}=\frac{2-2\sqrt{7201}}{2}
$
$X_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-2)+2\sqrt{7201}}{2*1}=\frac{2+2\sqrt{7201}}{2}
$