2x^2+x^2=38

Solution for 2x^2+x^2=38 equation:

2x^2+x^2=38

We move all terms to the left:

2x^2+x^2-(38)=0

We add all the numbers together, and all the variables

3x^2-38=0

a = 3; b = 0; c = -38;
Δ = b2-4ac
Δ = 02-4·3·(-38)
Δ = 456
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:

$\sqrt{\Delta}=\sqrt{456}=\sqrt{4*114}=\sqrt{4}*\sqrt{114}=2\sqrt{114}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0)-2\sqrt{114}}{2*3}=\frac{0-2\sqrt{114}}{6}
=-\frac{2\sqrt{114}}{6}
=-\frac{\sqrt{114}}{3}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+2\sqrt{114}}{2*3}=\frac{0+2\sqrt{114}}{6}
=\frac{2\sqrt{114}}{6}
=\frac{\sqrt{114}}{3}
$