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What are the three laws of logarithms?
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High School Teacher
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log x + log y = log (x*y)
log 2 + log 5 = log (2*5) = log 10 = 1
log x - log y = log x/y
log 100 - log 10 = log 100/10 = log 10 = 1
log x^a = a* log x
log 100 = log 10^2 = 2*log 10 = 2*1 = 2
Posted by hala718 on February 8, 2011 at 11:15 PM (Answer #1)
There are many laws of logarithms, I do not know which three you are referring you.
Here are a few laws that are commonly used:
log(a*b) = log a + log b, used while multiplying numbers
log(a/b) = log a - log b, used while dividing numbers
log(a^n) = n*log a, used to find the power of a number
log(a) b = [log(c) b] / [log(c) a], used to change the base of the log from a to c
log(b) a = 1/ log(a) b
log(a) a = 1
Posted by justaguide on February 8, 2011 at 11:20 PM (Answer #2)
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