Thursday, 22 January 2015

exponentiation - Why does any nonzero number to the zeroth power = 1?




I can't properly wrap my head around this odd concept, though I feel I'm almost there.




A non-zero base raised to the power of 0 always results in 1.
After some thinking, I figured this is the proof:
x2x2=x22=x0=1



Assuming that's true, would it be correct to assume that anything raised to 0 is a "whole" (1)? Because if x2x2=1, then no matter what x is, it will always result in 1.



I would like to understand this concept intuitively and deeply, rather than just memorizing that x0=1



EDIT: Thank you all for the answers. Each and everyone of them have been insightful and I've now gained a deeper understanding. This is a new account, so it seems I can't upvote, but if I could I would upvote each and everyone of you. Thanks :)



Answer



Here's a good heuristic that helped me feel better about it back in the day:



Consider any number x to any power. We will choose, say, 53.



53=125. Divide both sides by 5. You get 52=25, which we know. Again. Then you get 51=5. We usually leave exponents of 1 off but we'll keep it here. Do you see what happens? The power goes down by 1 each time. We can do it again. Then following our pattern, 50=1. But 5 wasn't special!



You can do this with any real number. Of course, for irrationals it can get a little fuzzy.



By the way, we can keep going. Divide by 5 again. You get 51=15. I hope this helps!



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