Answer:
9n^2 + 33n + 30
Explanation:
You're looking to multiply these two binomials together, and then to simplify the result, to obtain the product.
Have you used the "FOIL" method of multiplying binomials?
That's what we'll apply here.
F: first terms. The product of the first terms 3n and 3n is 9n^2.
O: outer terms. The product of the outer terms 3n and 6 is 18n.
I: inner terms: 15n
L: last terms: 30
Putting this all together, we get 9n^2 + 18n + 15n + 30, or
9n^2 + 33n + 30 (this is the desired answer, the product of (3n + 5) and (3n+6).