3x^2=261

Solution for 3x^2=261 equation:

3x^2=261

We move all terms to the left:

3x^2-(261)=0

a = 3; b = 0; c = -261;
Δ = b2-4ac
Δ = 02-4·3·(-261)
Δ = 3132
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:

$\sqrt{\Delta}=\sqrt{3132}=\sqrt{36*87}=\sqrt{36}*\sqrt{87}=6\sqrt{87}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0)-6\sqrt{87}}{2*3}=\frac{0-6\sqrt{87}}{6}
=-\frac{6\sqrt{87}}{6}
=-\sqrt{87}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+6\sqrt{87}}{2*3}=\frac{0+6\sqrt{87}}{6}
=\frac{6\sqrt{87}}{6}
=\sqrt{87}
$