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Learn about the change of base rule for logarithms on Khan Academy.
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Proof of the logarithm change of base rule - Khan Academy
If you want to figure out the logarithm base, let's say, base 3 of, let's say, 25, you can use your calculator either using log base 10 or log base 2. So you could say that this is going to be …
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Khan Academy offers a free introduction to logarithms, explaining their basics and how to evaluate them.
Logarithm - Khan Academy Help Center
2017年5月3日 · To find the log base a, where a is presumably some number other than 10 or e, otherwise you would just use the calculator, Take the log of the argument divided by the log of …
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Learn about the logarithm of a power and how to calculate it.
خان اکیڈیمی - Khan Academy
Sal approximates log₅(100) by rewriting it as log(100)/log(5) using the change of base rule, then evaluates with a calculator.