Question

Please show work having a brain fart

Answer 1

$\bf 10c^6(8c^2+3c)\implies 10c^6\cdot 8c^2+10c^6\cdot 3c^1 \\\\\\ 10\cdot 8c^6c^2+10\cdot 3+c^6c^1\implies 80c^{6+2}+30c^{6+1}\implies 80c^8+30c^7$