Tom K. answered 07/23/20
Knowledgeable and Friendly Math and Statistics Tutor
Your factoring was correct. However, if it is desired to factor the polynomial into monomials using complex or irrational roots, you need to keep going with the x^2 + 11 term; nothing can be done with the x^3 term unless the homework is expecting you to write this as x * x * x
x^2 + 11 = (x + √11 i)(x - √11 i)
Then, depending on what the assignment is looking for, the answer is either x^3(x + √11 i)(x - √11 i) or
x*x*x*(x + √11 i)*(x - √11 i)