Which choices are real numbers? check all that apply.
a. (-131072)^1/7
b. (-531441)^1/12
c. (-1024)^1/5
d. (-256)^1/8

Exponents with fractions in them are really just radical notation in a different form. You've probably seen the square root sign.



That can be written as 

x^(1/2)

...and when you take an even root of a negative number, there is no real answer. (2 is an even number).

Looking at the answer choices here, we can see that B and D use even roots, so they will give non-real answers.

So, A and C are the answer choices to select.

For the first question the answer is a, for the second c, for the third d, for the 4th b, for the 5th a