2*³√x² - 3*³√x = 20 find x

 2*³√x² - 3*³√x = 20  

   find  x

To solve the equation 2³√x² - 3³√x = 20, we can   a let  y=³√x  

2y^2-3y-20=0

then

2y+5=0

y-4=0

y=-5/2 

or 

y=4

then

x=4^3==64

x=(-5/2)^3=-125/8=15.625