# What are all the possible rational zeros for #f(x)=2x^3+x^2-2x-1# and how do you find all zeros?

##### 1 Answer

Mar 27, 2017

All of the roots are rational:

#### Explanation:

Usually, it is hard to find the zeros of third-degree polynomials. However, for this one, we can do so by a special trick.

We can rewrite this polynomial as