Hi this is Rob. I am going to show you how
to calculate Logarithms on the TI-84 Plus CE Graphing Calculator. A quick review on logarithms. A logarithm
is a way to solve for x, when x is an exponent. For example, 10 to the x power equals 1000.
This 10 is called the base. The way we write the above expression as a logarithm is log
1000, which is equal to 3. Thus, x equals 3 in the above expression. Why? Because 10
times 10 times 10 equals 1000. In logarithms we write the base here, except
if the base is 10, then we leave this area blank. Solving base 10 logarithms on the TI
84 Plus CE Graphing Calculator is fairly easy. On the calculator press this log button here.
This log open parenthesis appears. Enter 1000 and closed parenthesis here. Now press the
enter key. And there is the answer to the right. 3. Ok, what if the logarithm is not a base 10
logarithm. For example: 2 to the x power equals 16. In this problem the base is Base 2. X
equals 4 because 2 times 2 times 2 times 2 equals 16. How do we calculate a logarithm on the calculator
when the base is not base 10?. Here is our equation with a base of 2. And here is how
we write that equation in log notation. Log 2 16. On the calculator, press the math key here.
Stay in this column, MATH. Move down with the down arrow key to here. logBASE. Press
the enter key. This screen pops up. Enter the base, in this case it is base 2. Press
the right arrow key until you get inside the parenthesis. Enter 16. Press enter to get
the answer. And there to the right is the answer, 4. OK, that is it. That is how to calculate any
base logarithms on the TI-84 Plus CE Graphing Calculator. If you like this video, please
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