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Calculate logarithm base 30 of 8 if lg5=a and lg3=b
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According to the logarithm change of base rule,
lg stands for log with base 10. So,
Again, log2=log(10/5)=log10-log5 =1-a [ since log5=a....(given)]
Now, putting the values of log2, log3 and log5 in (i) we get:
Hence, the required answer is `(3-3a)/(1+b)`
Posted by llltkl on May 10, 2013 at 10:15 AM (Answer #1)
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