Question 8526
Have you studied what it means to raise a number to the zeroth power?
That is, what is {{{x^0}}}?
Hint: remember that {{{(x^a)(x^b)=x^(a+b)}}}
So, {{{(x^1)(x^-1)=x^0}}}
And, {{{(x^1)(x^-1)=(x^1)/(x^1)}}}
What is {{{x^0}}}?

Your problem has a quantity raised to the zeroth power.