Use the form below to do your conversion.
Solution
Step1
Log217979=Log(7979) ÷ Log(21)
Log(7979)= 3.9019484650731
Log(21)=1.3222192947339
Log217979=3.9019484650731 ÷ 1.3222192947339
Ans=2.9510599948236
Step2
Alternatively, the logarithm can be calculated like this.