Question 54155
I'm guessing at your exponents here, but assuming your equation is {{{u^4w^3-16w^3}}} factors into {{{w^3*(u^4-16)}}}, which further factors into {{{w^3*(u^2-4)(u^2+4)}}}, which still factors into {{{w^3*(u-2)(u+2)(u^2+4)}}}.