Use grouping to factor each polynomial completely.
x3 + ax + 3a + 3 x2
Hello and thank you for posting your question to Brainmass.
Here is the solution:
x^3 + a*x + 3*x^2 + 3*a = x * (x^2 + a) + 3 * (x^2 + a)
This provides one example of factoring a polynomial.