please solve this in full method
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Formulae:
log a + log b = log a×b
log a - log b = log a/b
log a^n = n log a
Soln.
log 81 + log 64 + log 5 - log 72
= log 9² + log 8² + log 5 - log 72
= 2 log 9 + 2 log 8 + log 5 - log 72
= 2 ( log 9 + log 8 ) + log 5 - log 72
= 2 ( log 9×8 ) + log 5 - log 72
= 2 log 72 + log 5 - log 72
= log 72 + log 5
= log 72×5
= log 360
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