Question

Which expression or equivalent to the one below Check all that apply Log ^9 1 • log^9 81

Answer 1

$\log_91\cdot\log_981=\log_99^0\cdot\log_99^2=0\log_99\cdot2\log_99=0\cdot1\cdot2\cdot1=0\\\\Used:\\\\\log_ab^n=n\log_ab\\\\\log_aa=1\\---------------------\\\\\log_a1=0\ because\ a^0=1,\ therefore\\\\\log_91\cdot\log_981=0\cdot\log_981=0$