Solve the inequality $x^3 + 4x > 5x^2$.
factor to get x(x-1)(x-4)=0 so the answer is:
(0, 1) U (4, infinity)
using this as a system of inequalities for a solution won't work because for some reason web2.0calc can't render it
just convert (0, 1) U (4, infinity) into a system of inequalities for a solution if that's what you're looking for