jika 5log2:a tentukan log 2,5

Materi : Logaritma

Pembahasan :
⁵log 2 = a

Log 2,5
= ⁵Log 2,5 / ⁵Log 10
= ⁵log (25/10) / ⁵log (2 x 5)
= [⁵log 25 - ⁵log 10] / [⁵log 2 + ⁵log 5]
= [1 - (⁵log 2 + ⁵log 5)] / [a + 1]
= [1 - (a + 1)]/(a + 1)
= - a/(a + 1)