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1.alogb = c => ac = b
Contoh : 1. 2log8 = 3 => 23 = 8
2. log100 =2 => 102 = 100
2. aloga = 1, maka alogab = b
Contoh : 1. 2log2 =1
2. 5log52 = 2
3. log103 = 3
3. alogb + alogc = alogb.c
Contoh : 1. 2log8 + 2log4 = 2log32
2log23 + 2log22 = 2log25
3 + 2 = 5
4. alogb - alogc = alogb/c
Contoh : 1. 2log64 - 2log8 = 2log8
2log26 - 2log23 = 2log23
6 - 3 = 3
5. alogbc = c alogb
Contoh : 1. 2log9 = 2log32 = 2 2log3
2. log125 = log53 = 3 log5
6. alogb = plogb/ploga
Contoh : 1. 5log7 = 2log7/2log5 = 3log7/3log5
2. 3log2 = log2/log3 = 5log2/5log3
7. alogb . blogc = alogc
Contoh : 1. 2log5 . 5log8 = 2log8
= 2log23
= 3
atau dengan cara : 1. 2log5 . 5log8 = log5/log2 . log8/log5
= log8/log2
= log23/log2
= 3log2/log2
= 3
8. aclogbd = d/c . alogb
Contoh : 1.23log24 = 4/3 . 2log2
= 4/3 . 1
= 4/3
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