5x^2/3=320

Solution for 5x^2/3=320 equation:

5x^2/3=320

We move all terms to the left:

5x^2/3-(320)=0

We multiply all the terms by the denominator


5x^2-320*3=0

We add all the numbers together, and all the variables

5x^2-960=0

a = 5; b = 0; c = -960;
Δ = b2-4ac
Δ = 02-4·5·(-960)
Δ = 19200
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:

$\sqrt{\Delta}=\sqrt{19200}=\sqrt{6400*3}=\sqrt{6400}*\sqrt{3}=80\sqrt{3}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0)-80\sqrt{3}}{2*5}=\frac{0-80\sqrt{3}}{10}
=-\frac{80\sqrt{3}}{10}
=-8\sqrt{3}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+80\sqrt{3}}{2*5}=\frac{0+80\sqrt{3}}{10}
=\frac{80\sqrt{3}}{10}
=8\sqrt{3}
$