20nsecond +3n third
I think this is what you mean
20n^2 + 3n^3
Are you supposed to simplify the expression? If so, then the only thing that will factor is a power of n.
To simplify the expression 20n^2 + 3n^3, you can rewrite it as a common factor of n:
n(20n + 3n^2)
Now, you can see that the common factor is "n". So, the expression can be simplified further to:
n(20 + 3n)
And that's the simplified form of the expression 20n^2 + 3n^3.