Thread: calculator help

i need to know how to get this on a calculator

81 = 3 power of 4

25 = 5 power of 2

if anyone knows how to do it with there calc i can prolly apply it to mine thanks

Originally Posted by realistic

i need to know how to get this on a calculator

81 = 3 power of 4

25 = 5 power of 2

if anyone knows how to do it with there calc i can prolly apply it to mine thanks

The ^ button means "raised to the" .

Originally Posted by VonNemo19

The ^ button means "raised to the" .

hi i can get 3 ^ 4 = 81

however i need the reverse how to get 3 ^4

Originally Posted by realistic

hi i can get 3 ^ 4 = 81

however i need the reverse how to get 3 ^4

AAAAAAAAAAhhhh. I see. Well, I'm with you, then. I'd like to know if a calculator could do that, too. However, I must say that factoring is probably quiker than picking up the calculator...

Originally Posted by VonNemo19

AAAAAAAAAAhhhh. I see. Well, I'm with you, then. I'd like to know if a calculator could do that, too. However, I must say that factoring is probably quiker than picking up the calculator...

for example if i have 625 is there a fast way to find out its 5^4

just takes me too long sometimes to do it

Originally Posted by realistic

for example if i have 625 is there a fast way to find out its 5^4

just takes me too long sometimes to do it

Numbers are great! When I see the number 625, I automatically say to myself that this is divisible by 25. Then I have

And the rest is history...

Originally Posted by realistic

for example if i have 625 is there a fast way to find out its 5^4

If you're not given the 5 or the 4, then there's no "fast way".

Originally Posted by Wilmer

If you're not given the 5 or the 4, then there's no "fast way".

ok, say you are given the 5 how do you enter it in the calculator to get the ^ 4

You then need 5^x = 625.
So x = log(625) / log(5) ; got an "ln" key on your calculator?

If 4 is the given, then x^4 = 625.
So x = 625^(1/4).

Tattoo this on your wrist (under your watch!):
If a^b = c, then a = c^(1/b)
If a^b = c, then b = log(c) / log(a)