A positive exponent in the denominator of a fraction, with one in the numerator. For example:
4-2 = 1/42
(Formatting difficult: read fraction as "one over four squared")
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negative 4 with negative 3 as an exponent
the exponent is a negative
A number to a negative exponent is the inverse of the number to the positive exponent. That is, x-a = 1/xa
If you have a negative exponent, then put 1/the number multiplied by itself the number of times of the exponent. For example: 3-2=1/(3x3)=1/9
Negative x negative x negative = negative.