Tolong di jawab soal No. 8

³log 20 = ⁴log 20 / ⁴log 3
= ⁴log (5×4) / ⁴log 3
= (⁴log 5 + ⁴log 4) / ⁴log 3
= (1/a + 1) / b
kalikan dengan a
= (1 + a) / ab