The polynomial is .

The general quadratic expression form is .

In the above trinomial, .You need to find two numbers with a sum of 3 and a product of  .

Make a list of the factors of 20 and look for the of factors with the sum of 3.

There is no factors with a sum of 3.

So, the quadratic expression cannot be factored using integers.

Therefore, is prime.

The polynomial, is prime.