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Joined February 2010
Originally posted by : Archana |
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wat s the ans of the que:
log2x+log4x=
A)16
b)32
c)6 |
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Answer is 16..Because 16 can be 2 raise to power 4 and also 4 raise to power 2.
So,log x to base 2 is written as log 2 raise to 4 to the base 2.so log 2 to base 2 is 1 .So it becomes 4.Similarly log x to base 4 becomes log 4 raise to 2 with base 4.So it becomes 2.Add both you get 2+4=6.
Question was log x to base 2 +log x to base 4=6 so find x.