2x^2+2=120

Solution for 2x^2+2=120 equation:

2x^2+2=120

We move all terms to the left:

2x^2+2-(120)=0

We add all the numbers together, and all the variables

2x^2-118=0

a = 2; b = 0; c = -118;
Δ = b2-4ac
Δ = 02-4·2·(-118)
Δ = 944
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:

$\sqrt{\Delta}=\sqrt{944}=\sqrt{16*59}=\sqrt{16}*\sqrt{59}=4\sqrt{59}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0)-4\sqrt{59}}{2*2}=\frac{0-4\sqrt{59}}{4}
=-\frac{4\sqrt{59}}{4}
=-\sqrt{59}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+4\sqrt{59}}{2*2}=\frac{0+4\sqrt{59}}{4}
=\frac{4\sqrt{59}}{4}
=\sqrt{59}
$