Education Technology

Solution 11579: Calculating Logs of Bases Other Than 10 Using the TI-83 Family, TI-84 Plus Family, and TI-Nspire™ Handheld in TI-84 Plus Mode.

How do I calculate logs of bases other than 10 using a TI-83 family, TI-84 Plus family, and TI-Nspire handheld in TI-84 Plus Mode?

The logbase( function can be used to perform log calculations with bases other than 10 using the TI-84 Plus family and TI-Nspire handheld in TI-84 Plus mode. For TI-83 family users, the log( function can be used.

Example: Calculate log4160

NOTE: The steps and screenshot below were created using the TI-84 Plus family Operating System v 2.55MP.

• Press [ALPHA] [WINDOW] [5] to access the FUNC menu and insert the logbase( function. 
• Input 4 for the base.
• Scroll to the right and input 160 for the log value.
• Press [ENTER] to complete the calculation.

For TI-83 family users:

• Press [LOG], input 160, then press [ ) ].
• Press [÷].
• Press [LOG], input 4, then press [ ) ].
• Press [ENTER] to complete the calculation.

Please see the TI-83 family and TI-84 Plus family guidebooks for additional information.

TI-Nspire handheld in TI-84 Plus mode users may refer to the TI-84 Plus family guidebook.