Question

How do you factor `2ab^4 - 4a^2b^3`?

Answer 1

`2ab^4-4a^2b^3`

Examining both terms we can see the common factors:
`2`, `a`, and `b^3`

So we can write
`2ab^4-4a^2b^3 = (2ab^3)(b-2a)`