Question 250577
I will assume that everything is over 3x

Look again for something else to pull out of 3(3x^3-x^2) 
Remember that x^3=x*x*x and x^2=x*x

The denominator 3x should be a hint
after you pull out one more item then that has another set of factors.
Hint :Can you factor (6w^2-w)? yes of course you can.