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November 2nd, 2009, 07:50 PM
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| |  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 |
November 2nd, 2009, 07:59 PM
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Quote:
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" .
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November 2nd, 2009, 08:02 PM
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Quote:
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 |
November 2nd, 2009, 08:06 PM
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Quote:
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...
__________________ "Then thou carriedst thine ashes into the mountains: wilt thou now carry thy fire into the valleys?" Thus Spake Zarathustra Friedrich Nietzsche If you would like to know how the quadratic formula was derived, visit my post entitled: Deriving the Quadratic Formula. |
November 2nd, 2009, 08:09 PM
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Quote:
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  |
November 2nd, 2009, 08:13 PM
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Quote:
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...
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November 2nd, 2009, 08:16 PM
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Quote:
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".
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November 2nd, 2009, 08:53 PM
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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 |
November 2nd, 2009, 09:37 PM
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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)
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