1. logₐMN = logₐM + logₐN
2. logₐM/N = logₐM - logₐN
3. logₐM = logₐN if and only if M = N
4. logₐM^k = klogₐM for any real number k. use when solving an exponential.
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Ex.1: Expand:
log XY^2=
log X+ 2log Y
Ex.2: Condense:
log 6- log 5+ log 2=
log 12/5
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