The TI-83 is a graphing calculator created by Texas Instruments, also known as TI. TI invented the first handheld calculator in 1967. The TI-83 was introduced in 1996. The "LOG" button on a TI-83 is for logarithms, which reverse the process of exponentiation. The "LOG" button on a TI-83 uses log base 10. To enter the log of a different base, you will need to use the change of base property: logb(x) is the same as log(x)/log(b).
Press the "LOG" button, enter the number you want to take the log of and press the ")" key.
Press the "÷" key.
Press the "LOG" button and then enter the number of the base and ")".
Press the "ENTER" key.