Question

Jika 3log4 = a, 3log5= b, maka 8log20=?

Answer 1

3 log 4 = a
3 log 5 = b

pakai sifat alogb = c log b
----------
c log a

3 log 20 3 log (4 × 5) 3 log 4 + 3 log 5
------------- = -------------------- = -------------------------
3 log 8 3 log (2 × 4) 3 log 2 + 3 log 4


= a + b 3a + 3b
------------ = ------------
1/a + a a