By definitions,x^0 = 1 for any non-zero number x
also
0^x = 0 for any positive x
So, if 0^0 was defined, then the first definition would say it was equal to 1 and the second that it was equal to 0.
There is a more detailed but complicated explanation which relies on limits but I hope this will suffice.
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There is the following contradiction: if you raise zero to any power, you get zero; if you raise any number to the power zero, you get one.
a value of zero in the denominator makes the fraction undefined
Undefined: You cannot divide by zero
Undefined: You cannot divide by zero
zero is horizontal, undefined is vertical
Undefined: You cannot divide by zero