Soal Logaritma
Sederhanakan logaritma berikut ini!
2
log 25 .
5
log 4 +
2
log 6 –
2
log 3
9
log 36 /
3
log 7
9^(
3
log 7)
Jawab :
a. 2
log 25 .
5
log 4 +
2
log 6 –
2
log 3
= 2 log 52 . 5 log 22 + 2 log (3.2/3)
= 2.2 . 2 log 5 . 5 log 2+ 2 log 2
= 2 . 2 log 2 + 1
= 2 . 1 + 1
= 3
b. 9
log 4 /
3
log 7
= 3^2 log 22 / 3 log 7
= 3 log 2 / 3 log 7
= 7 log 2
c. 9^(
3
log 7)
= 32 ^(3 log 7)
= 3^(2 .3 log 7)
= 3^(3 log 49)
= 49
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