Negative Integers as Exponents:

For any nonzero real number raised to a negative integer, take the reciprocal of the number and
change the sign of the exponents.

Remember: Cross the line, Change the sign. When you have negative exponents, change the problem to a fraction, if not, by dividing by 1. If the variable/number with the negative exponent is on the top, then move the variable/number to the bottom and change the negative exponent to positive exponent. If the variable/number with the negative exponent is on the bottom, then move the variable/number to the top and change the negative exponent to positive exponent.

Example:

Express with positive exponents then simplify.