What is the factored form of 2x^3+4x^2–x?

Question

What is the factored form of 2x^3 + 4x^2 – x?

Answer 1

2x^3 + 4x^2 – x

First, I factor out an x:

x(2x^2 + 4x - 1)

Is there more that we are supposed to be able to do?  Because it looks like this expression, 2x^2 + 4x - 1, is unfactorable.