# Math Help - FX-100AU, Logarithms

1. ## FX-100AU, Logarithms

Hi all,

I'm having trouble entering logarithms different to base 10.

For instance, I want to type in $\log_{2}16$ and get the answer of 4.

Any idea how to do this?

Thanks folks.

2. Originally Posted by Peleus
Hi all,

I'm having trouble entering logarithms different to base 10.

For instance, I want to type in $\log_{2}16$ and get the answer of 4.

Any idea how to do this?

Thanks folks.
Hello Peleus,

I don't think you can do it that way. I've not seen a calculator that allows you to enter a log to any base. Calculators generally have common "log" to base 10 or natural "ln" to base e. I think you will have to use the change of base formula and enter it this way:

$\frac{\log 16}{\log 2}=4$ or $\frac{\ln 16}{\ln 2}=4$