X*x=13000

Solution for X*x=13000 equation:

X*X=13000

We move all terms to the left:

X*X-(13000)=0

Wy multiply elements

X^2-13000=0

a = 1; b = 0; c = -13000;
Δ = b2-4ac
Δ = 02-4·1·(-13000)
Δ = 52000
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:

$\sqrt{\Delta}=\sqrt{52000}=\sqrt{400*130}=\sqrt{400}*\sqrt{130}=20\sqrt{130}$
$X_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0)-20\sqrt{130}}{2*1}=\frac{0-20\sqrt{130}}{2}
=-\frac{20\sqrt{130}}{2}
=-10\sqrt{130}
$
$X_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+20\sqrt{130}}{2*1}=\frac{0+20\sqrt{130}}{2}
=\frac{20\sqrt{130}}{2}
=10\sqrt{130}
$