Express the monomial as a product of its factors.
Express 5 as a product of 1 · 5.
5a2 b = 1 · 5· a2 · b
5a2 b = 1 · 5 · a · a · b (Express a2 as a product of a · a)
The factors of 5a2 b is 1 · 5 · a · a · b.