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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