2 log 99 3 + logg 99 11
Log a b + log a c = log a (bc) 2log₉₉ 3 + log₉₉ 11 = log₉₉ 3² + log₉₉ 11 = log₉₉ 9 + log₉₉ 11 = log₉₉ 99 = 1