The answer section is saying that this is not a real number.The -1/4 is an exponent.

First off I'd like to make sure I have the question correct.

is asking me for the quotient of one and the negative quotient of the fourth root's of 1 and 36. Which ends up as the quotient of and .

Secondly, although i understand that this is not a real number, I am confused by the vague definition. If it isnt a real number what is it?