please help. collect like terms. 3u⁹v-3uv⁸+4u⁹v-4uv⁸

[latex]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) [/latex]

[latex]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) [/latex]