$\"\"$

The polynomial fuction with integral is $\"\"$

The function is $\"\"$ .

The coefficient of $\"\"$ is 3 and the constant term is 15.

Compare the above fuction, the value of . $\"\"$

The possible rational zeros are $\"\"$ .

The possible rational zeros $\"\"$

The possible rational zeros are . $\"\"$ . $\"\"$

The possible rational zeros are $\"\"$ .