Answer:
9r^4−r^3s−8r^2s^2+5rs^3+37
Explanation:
Distribute the Negative Sign:
=29r4−11r3s+5r2s2+19rs3+4+−1(20r4−10r3s+13r2s2+14rs3−33)
=29r4+−11r3s+5r2s2+19rs3+4+−1(20r4)+−1(−10r3s)+−1(13r2s2)+−1(14rs3)+(−1)(−33)
=29r4+−11r3s+5r2s2+19rs3+4+−20r4+10r3s+−13r2s2+−14rs3+33
Combine Like Terms:
=29r4+−11r3s+5r2s2+19rs3+4+−20r4+10r3s+−13r2s2+−14rs3+33
=(29r4+−20r4)+(−11r3s+10r3s)+(5r2s2+−13r2s2)+(19rs3+−14rs3)+(4+33)
=9r4+−r3s+−8r2s2+5rs3+37
Hope this helps! :)