Question

How do you factor `3a^3b + 21a^2b^4`?

Answer 1

`3a^2b(a+7b^3)`

Explanation:

`3a^3b+21a^2b^4`
`=3(a^3b+7a^2b^4)`
`=3a^2(ab+7b^4)`
`=3a^2b(a+7b^3)`