Use the Binomial Theorem to expand the binomial.
(s+3v)^5
- s^5 - 5s^4 + 10s^3v^2 + 5sv^4 - v^5
- s^5 + 15s^4v + 90s^3v^2 + 270s^2v^3 + 405sv^4 + 243v^5
- s^5 + 45s^4v + 270s^2v^3 + 810s^2v^3 + 1,215sv^4 + 729v^5
- s^5 + 15s^4 + 90s^3 + 270s^2 + 405s + 243