Inactive Tutor answered 12/13/12
Tutor
New to Wyzant
Collect all terms in one side and do factorization,
x3-4x = x(x+2)(x-2) < 0
Check intervals: (-oo, -2), (-2, 0) , (0, 2) and (2, oo)
Answer: (-oo, -2) U (0, 2)