Jika log 2 = 0,301 dan log 3 = 0,477.
log ∛225 = log (225)1/3
= log (15²)1/3
= 2/3 log 15
= 2/3 log (30/2)
= 2/3 log 10(10.3/2)
= 2/3 log 10 + log 3 – log 2
= 2/3 1 + 0,477 – 0,301
= 2,352 : 3 = 0,784