Question

How do you factor `r^2 - 6tw + 3wr - 2tr` by grouping?

Answer 1

`(r+3w)(r-2t)`

Explanation:

First rearrange to get similar items together
`r^2 +3wr - 6tw - 2tr`
Take out common factors
`=r(r+3w) -2t(3w +r)`
`=r(r+3w) -2t(r +3w)`
`=(r+3w)(r-2t)`