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log 75
=2 log 225
2 log 75
=2 log (5.3.5.3)
2 log (5.5.3)
= 2 log 5+ 2 log 3 + 2 log 5+2 log 3
2 log 5 + 2log 5 + 2log3
=1/a + b +1/a + b= 2/a + 2b _kedua ruas dikali sehingga menjadi:
1/a + 1/a + b 2/a + b
= 2 + 2ab _ cara ini dikerjakan sesuai sifat logartma a log b=n log b
2 + ab n log a