3log5=a dan 3log16=b maka nilai 3log500√5 adalah

³log5 = a
³log16 = b
³log4 = b/2

³log500√5 = ³log(5³ x 4 x 5^½)
= 3 x ³log5 + ³log4 + ½ x ³log5
= 3a + b/2 + a/2
= (7a + b)/2