30000=x*3x

Solution for 30000=x*3x equation:

30000=x*3x

We move all terms to the left:

30000-(x*3x)=0

We add all the numbers together, and all the variables

-(+x*3x)+30000=0

We get rid of parentheses

-x*3x+30000=0

Wy multiply elements

-3x^2+30000=0

a = -3; b = 0; c = +30000;
Δ = b2-4ac
Δ = 02-4·(-3)·30000
Δ = 360000
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{360000}=600$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0)-600}{2*-3}=\frac{-600}{-6}
=+100
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+600}{2*-3}=\frac{600}{-6}
=-100
$