Use the form below to do your conversion.
Solution
Step1
Log217105=Log(7105) ÷ Log(21)
Log(7105)= 3.8515640822635
Log(21)=1.3222192947339
Log217105=3.8515640822635 ÷ 1.3222192947339
Ans=2.9129540747162
Step2
Alternatively, the logarithm can be calculated like this.