Question

How do you factor `2h^3+h^2-18h-9` by grouping?

Answer 1

`=(2h+1)(h+3)(h-3)`

Explanation:

`2h^3+h^2-18h-9`
`=h^2(2h+1)-9(2h+1)`
`=(2h+1)(h^2-9)`
`=(2h+1)(h+3)(h-3)`