excuse my stupidity

eurotrotter

hey guys
its been ages since iv done maths.
but i need to know where the 'mod' key is on the scientific calculator
i need to calculate:

5^6 mod23

just an example of what i need to do

please don't laugh!
i also need to calculate g in the following equation:

g^ ((6)(15)) = 2
thanks

Sherifu

You mean the modulus operator?

Usually Mod is on the key afair.

SkepticOne

eurotrotter wrote: »

i also need to calculate g in the following equation:

g^ ((6)(15)) = 2
thanks

g^(6*15) = 2

raise both sides of the equation to the power of 1/(6*15) to isolate g

g = 2 ^ (1 / (6*15) )

I make

g = 1.00773136922

test
1.00773136922^(6*15) = 2.00000000051

SkepticOne

g = -1.00773136922 would also be a solution.

LeixlipRed

Hold on a sec!!! Modular arithmetic only deals with integers so ignore that post. You need to calculate 5^6 (mod23). You can easily do this on a calculator but if you want an explanation of how to do it as a general method then post again. Get 5^6 on your calculator. 5^6=15625. Divide this number by 23. It goes in 679 times plus some remainder. The remainder is your answer. So mulyiply 23 by 679 and take this away from 15625 which gives you 8. So 5^6 =8 (mod 23).

EDIT: Oops, didn't read that right. The method for finding g is fine (assuming you're not dealing with modular arithmetic there too).

Fremen

eurotrotter wrote: »

hey guys
its been ages since iv done maths.
but i need to know where the 'mod' key is on the scientific calculator
i need to calculate:

5^6 mod23

just an example of what i need to do

please don't laugh!
i also need to calculate g in the following equation:

g^ ((6)(15)) = 2
thanks

You could also take natural logs of both sides, and then use ln(x^a) = a*ln(x)

so ln(g)*6*15 = ln 2
ln g = (ln 2)/6*15
g = e^[(ln2)/6*15]

I don't think I've ever seen a mod button on a calculator, but then again, it's been six years since I've used one.

ZorbaTehZ

Fremen wrote: »

I don't think I've ever seen a mod button on a calculator, but then again, it's been six years since I've used one.

Me neither, I think you'd probably have to get a graphing calculator or something to get it.

mathias

I don't think I've ever seen a mod button on a calculator, but then again, it's been six years since I've used one.

Me neither, I think you'd probably have to get a graphing calculator or something to get it.

Assuming cos you are all able to post here you all have access to a computer , then go to " Start , all programs , accessories , calculator".

Click on the View menu item , click Scientific , and the mod button is top of second column from the right

Now youve seen one !