Reciprocal is when you interchange the numerator (the number on top in a fraction) with the denominator (the number at the bottom in a fraction). The numerator, is now the denominator and the denominator is the numerator.
For example, the reciprocal of 2 is (1/2)
If you want a reciprocal of a fraction, which is inside a square root, we multiply -1 with the number in the root
For example, 〖(3/2)〗^2 becomes 〖(2/3)〗^-2
Hence n = -2