1. -log 7 36-log 7 14-3 log 7 √21 = ?

-log_7 36 - log_7 14 - 3 log_7 \(\sqrt{21}\) = -log_7 \(36 \times 14\) - log_7 \(\sqrt{21}\)^3 = -log_7 (504) - log_7 (21^{3/2}) = -log_7 (504) - log_7 \(21 \sqrt{21}\) = -log_7 \(504 \times 21 \sqrt{21}\) = -log_7 \(10584 \sqrt{21}\)