Simplify the following including like terms
13rs(squared)-r+42s(squared)+6s(squared)-8rs(squared)-3r
write it as
13rs^2 - r + 42s^2 + 6s^2 - 8rs^2 - 3r
= 5rs^2 + 48s^2 - 4r
13rs(squared)-r+42s(squared)+6s(squared)-8rs(squared)-3r
13rs^2 - r + 42s^2 + 6s^2 - 8rs^2 - 3r
= 5rs^2 + 48s^2 - 4r