x^2=900000

Solution for x^2=900000 equation:

x^2=900000

We move all terms to the left:

x^2-(900000)=0

a = 1; b = 0; c = -900000;
Δ = b2-4ac
Δ = 02-4·1·(-900000)
Δ = 3600000
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:

$\sqrt{\Delta}=\sqrt{3600000}=\sqrt{360000*10}=\sqrt{360000}*\sqrt{10}=600\sqrt{10}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0)-600\sqrt{10}}{2*1}=\frac{0-600\sqrt{10}}{2}
=-\frac{600\sqrt{10}}{2}
=-300\sqrt{10}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+600\sqrt{10}}{2*1}=\frac{0+600\sqrt{10}}{2}
=\frac{600\sqrt{10}}{2}
=300\sqrt{10}
$