Use the form below to do your conversion.
Solution
Step1
Log217109=Log(7109) ÷ Log(21)
Log(7109)= 3.8518085142282
Log(21)=1.3222192947339
Log217109=3.8518085142282 ÷ 1.3222192947339
Ans=2.9131389396366
Step2
Alternatively, the logarithm can be calculated like this.