I wanted to find “4 to the 7th power” (from a line of a song by C. W. McCall) on my Smartphone calculator. It has buttons for e to the x power, x squared, and y to the x power. Can any of those find the exponential I want?
y[sup]x[/sup] will give you 4[sup]7[/sup], though my phone presents it as x[sup]y[/sup]
Thanks! It worked. 
(16,384)
Whether the calculator uses y[sup]x[/sup] or x[sup]y[/sup] usually depends upon what order you must enter the arguments to get the right answer.
I do hope you know what 4 to the 7th power means so you could have multiplied 4444444= much faster than you could have posted here to ask.
Need answer fast!!! 
Or he could have taken the log (any base) of 4, multiplied by 7, and taken the antilog (same base) of the result.
Or the shortcut on prett much any calculator I’ve used “4 x = = = = = =” (Hit “4” then “x,” then equals six times.)
Isn’t the rule that you must depict the number with exactly four 4’s? How about
√4sup[/sup]
Perhaps I could, but I’m not that good at math. I don’t know offhand the “logs” of numbers.
Assuming you do not have an exponential key you could have done
ln(7)
ANS x 4
e^(ANS)
I don’t think this is correct (he says hesitantly). I’ve seen calculators where the “raise a number to a power” button is labeled as y[sup]x[/sup] or as x[sup]y[/sup] or as ^, but I don’t think that had anything to do with the way the button worked. Although I’m not familiar with all the different calculator models out there.
Right, but when’s the last time you saw a calculator without an exponential key, but that did have a ln key and an e^ key?
The standard Android calculator has a
^ key.
4^7=16384
umm, no? That would be 7[sup]4[/sup].
:smack: Right.
As a cross check take 16384 and raise to 1/7 power
16384^.142857 = 3.999994
slight rounding error but otherwise it gives the original base number of 4
16384^(1/7) = 4
Parentheses resolves the rounding error
Androids calculator isn’t bad. The root key seems to only do square roots. Raising a base number to a fractional power resolves that problem.
FWIW, I don’t have a ^ key. I do have a “x!” key, whatever that is.
Factorial. For example, pressing 5 x! gives you 5!, which is 1 x 2 x 3 x 4 x 5 (all the counting numbers up to 5, multiplied together).
One thing this is used for is to give you all the different orders (called “permutations”) that five different objects could be in.
If you don’t have a ^ key, do you have a differently-labeled key that does exponents (like x[sup]y[/sup])?
No, but I do have y to the x power…