x^2=780

Solution for x^2=780 equation:

x^2=780

We move all terms to the left:

x^2-(780)=0

a = 1; b = 0; c = -780;
Δ = b2-4ac
Δ = 02-4·1·(-780)
Δ = 3120
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:

$\sqrt{\Delta}=\sqrt{3120}=\sqrt{16*195}=\sqrt{16}*\sqrt{195}=4\sqrt{195}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0)-4\sqrt{195}}{2*1}=\frac{0-4\sqrt{195}}{2}
=-\frac{4\sqrt{195}}{2}
=-2\sqrt{195}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+4\sqrt{195}}{2*1}=\frac{0+4\sqrt{195}}{2}
=\frac{4\sqrt{195}}{2}
=2\sqrt{195}
$