Casio Calculator Q

sillysocks · 14-02-2010 08:17PM #1

Hi all,

Just a very quick question about solving an equation with an exponent with a calculator.

If I have say 2^x = 32

What is the calculator sequence that will give me what X is?

The example above is simple enough but I'd like to be able to do these on more complicated questions.

Thanks!

leedsfan88 · 14-02-2010 08:20PM

2x2x2x2x2 or else 2^5

Thomas_S_Hunterson · 14-02-2010 08:23PM

[latex]\displaystyle \frac{log(32)}{log(2)}[/latex] will give you x.

In general for [latex]a^x = b[/latex], you can use [latex]\displaystyle x = \frac{log(b)}{log(a)}[/latex]

sillysocks · 14-02-2010 08:25PM

leedsfan88 wrote: »

2x2x2x2x2 or else 2^5

Yes but I'm looking to find how to get the calculator to give me the figure for X.

Say if the question was 4^X = 262144, Find X.

Is there a button on the calculator that calculates this for me, so that it gives me the answer which is 9 in this case?

sillysocks · 14-02-2010 08:26PM

Sean_K wrote: »

[latex]\displaystyle \frac{log(32)}{log(2)}[/latex] will give you x.

In general for [latex]a^x = b[/latex], you can use [latex]\displaystyle x = \frac{log(b)}{log(a)}[/latex]

Thanks a lot! That'll do the trick.

Casio Calculator Q

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