2x^2+5=240

Solution for 2x^2+5=240 equation:

2x^2+5=240

We move all terms to the left:

2x^2+5-(240)=0

We add all the numbers together, and all the variables

2x^2-235=0

a = 2; b = 0; c = -235;
Δ = b2-4ac
Δ = 02-4·2·(-235)
Δ = 1880
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:

$\sqrt{\Delta}=\sqrt{1880}=\sqrt{4*470}=\sqrt{4}*\sqrt{470}=2\sqrt{470}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0)-2\sqrt{470}}{2*2}=\frac{0-2\sqrt{470}}{4}
=-\frac{2\sqrt{470}}{4}
=-\frac{\sqrt{470}}{2}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+2\sqrt{470}}{2*2}=\frac{0+2\sqrt{470}}{4}
=\frac{2\sqrt{470}}{4}
=\frac{\sqrt{470}}{2}
$