Use the form below to do your conversion.
Solution
Step1
Log217987=Log(7987) ÷ Log(21)
Log(7987)= 3.9023836844325
Log(21)=1.3222192947339
Log217987=3.9023836844325 ÷ 1.3222192947339
Ans=2.951389153051
Step2
Alternatively, the logarithm can be calculated like this.