Question

factor by grouping r^2-9tw+3wr-3tr

Answer 1

I think it's (r+3w)(r-3t)

Answer 2

\[r ^{2} - 9tw +3w r - 3tr\]
\[r ^{2} - 3tr - 9tw +3w r\]
\[r(r-3t) + w(-9t +3r)\]

Answer 3

Does that make sense?

Answer 4

Yes it does make sense