Question: how to write an expression using a negative exponent?
Answer: Negative Exponent If n is a positive integer and a≠0 a ≠ 0 , then a−n=1an a − n = 1 a n . The negative exponent tells us to re-write the expression by taking the reciprocal of the base and then changing the sign of the exponent. Any expression that has negative exponents is not considered to be in simplest form.