Sal evaluates log₂(8), log₈(2), log₂(⅛), and log₈(½).

Evaluate basic logarithmic expressions by using the fact that a^x=b is equivalent to log_a (b)=x.

You will learn what logarithms are, and evaluate some basic logarithms. This will prepare you for future work with logarithm expressions and functions.

Example: Evaluating log 2 (50) If your goal is to find the value of a logarithm, change the base to 10 or e since these logarithms can be calculated on most calculators. So let's change the base of log 2 (50) …

The change of base rule is a useful logarithmic property that allows us to evaluate logarithms of any base by using a calculator with a different base logarithm function. This property states that for any …

Learn about logarithms, properties, and solving equations with Khan Academy's free Algebra 2 course.

Evaluate basic logarithmic expressions by using the fact that a^x=b is equivalent to log_a (b)=x.

Evaluating logarithms with calculator Calculators usually only calculate log (which is log base 10 ) and ln (which is log base e ). Suppose, for example, we want to evaluate log 2 (7) . We can use the change …

This logarithm right over here will evaluate to 1/3. Fascinating. Let's mix it up a little bit more. Let's say we had the log base 2. Instead of 8, let's put a 1/8 right over here. So I'll give you a few seconds to …

Evaluate any logarithm in a calculator with the use of the change of base formula. Example: Evaluate log₅ (100).