4(x^2)-255=0

Solution for 4(x^2)-255=0 equation:

4(x^2)-255=0

a = 4; b = 0; c = -255;
Δ = b2-4ac
Δ = 02-4·4·(-255)
Δ = 4080
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:

$\sqrt{\Delta}=\sqrt{4080}=\sqrt{16*255}=\sqrt{16}*\sqrt{255}=4\sqrt{255}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0)-4\sqrt{255}}{2*4}=\frac{0-4\sqrt{255}}{8}
=-\frac{4\sqrt{255}}{8}
=-\frac{\sqrt{255}}{2}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+4\sqrt{255}}{2*4}=\frac{0+4\sqrt{255}}{8}
=\frac{4\sqrt{255}}{8}
=\frac{\sqrt{255}}{2}
$