Simplifying
3m3 + 33m2 + 90m

Reorder the terms:
90m + 33m2 + 3m3

Factor out the Greatest Common Factor (GCF), '3m'.
3m(30 + 11m + m2)

Factor a trinomial.
3m((6 + m)(5 + m))

Final result:
3m(6 + m)(5 + m)