Question 208366
{{{ax^3+27a}}}
{{{a*(x^3+27)}}} the second term is the sum of 2 cubes. There is a formula for that. Use it to get 
{{{a*(x+3)(x^2 - 3x + 9)}}}
This URL is really good at factoring --> http://72.3.253.76:8080/webMathematica3/quickmath/page.jsp?s1=algebra&s2=factor&s3=basic