Answer :

[tex]3u^9v-3uv^8+4u^9v-4uv^8=\\ uv(3u^8-3v^7+4u^8-4v^7)=\\ uv(3(u^8-v^7)+4(u^8-v^7))=\\ uv(3+4)(u^8-v^7)=\\ 7uv(u^8-v^7) [/tex]

Other Questions