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Q: What is positive exponents?

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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

positive

Positive exponents: an = a*a*a*...*a where there are n (>0) lots of a. Negative exponents: a-n = 1/(a*a*a*...*a) where there are n (>0) lots of a.

It is in the simplest form when all exponents are positive.

An exponent that is a positive integer. For example, x3 has a positive exponent, while 8-5 does not.

They can be written as reciprocals with positive exponents. For example, 5-7 = (1/5)7

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.

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