3x^2=255

Solution for 3x^2=255 equation:

3x^2=255

We move all terms to the left:

3x^2-(255)=0

a = 3; b = 0; c = -255;
Δ = b2-4ac
Δ = 02-4·3·(-255)
Δ = 3060
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:

$\sqrt{\Delta}=\sqrt{3060}=\sqrt{36*85}=\sqrt{36}*\sqrt{85}=6\sqrt{85}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0)-6\sqrt{85}}{2*3}=\frac{0-6\sqrt{85}}{6}
=-\frac{6\sqrt{85}}{6}
=-\sqrt{85}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+6\sqrt{85}}{2*3}=\frac{0+6\sqrt{85}}{6}
=\frac{6\sqrt{85}}{6}
=\sqrt{85}
$