Answer
See the explanation
Work Step by Step
Step 1
List Possible Zeros: list all possible rational zeros, using the rational zeros theorem.
The Rational Zero Theorem states that, if the polynomial $f(x)=a_{n}x^{n}+a_{nā1}x^{nā1}+...+a_{1}x+a_{0}$ has integer coefficients, then every rational zero of $f(x)$ has the form $p/q$ where $p$ is a factor of the constant term $a_{0}$ and $q$ is a factor of the leading coefficient $a_{n}$.
When the leading coefficient is $1$, the possible rational zeros are the factors of the constant term.
Step 2
Divide: use synthetic division to evaluate the polynomial at each of the candidates for the rational zeros that you found in Step 1. When the remainder is $0$, note the quotient you have obtained.
Step 3
Repeat Step 1 and Step 2 for the quotient. Stop when you reach a quotient that is quadratic or factors easily, and use the quadratic formula or factor to find the remaining zeros.