Question

I got (x-3)(x^2+9) is it right?

Answer 1

`(x^5-81x)/(x^2+3x)=\\ (x(x^4-81))/(x(x+3))=\\ (x^4-81)/(x+3)=\\ ((x^2-9)(x^2+9))/(x+3)=\\ ((x-3)(x+3)(x^2+9))/(x+3)=\\ (x-3)(x^2+9)`

Answer 2

Fantastic ! It's not an easy problem. I'm not even going to go into a
whole big presentation of how to do it. I'll just simply answer the
question you asked:

Yes! Your answer is correct.

Great work !