Look to the upper right of the number or variable, same place as positive exponents. This is probably not what you meant, but it's hard to tell what you did mean, so you might want to ask again and be more specific.
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You can have negative exponents anywhere. When they are in the denominator, they are equivalent to positive exponents in the numerator of a fraction.
by doing reciprocal
They are the reciprocals of the positive exponents. Thus, x-a = 1/xa
A negative exponent becomes positive in the reciprocal. So if you have a number a^x where x is negative, then, a^x = 1/(a^-x) and, since x is negative, -x is positive.
Put the number with the exponent in the denominator of a fraction and take off the negative symbol. The numerator in that fraction should be 1. Example: 8-2 Converts to: 1 --- 82