when an exponent is shifted from the left side of equal to to right side or visa verse
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why the exponents can not be negative
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.
They can be written as reciprocals with positive exponents. For example, 5-7 = (1/5)7
you make it into a fraction by puting whatever the negative exponent is attach to an pu that on the botttom of the fraction and leave a one on top
Negative times negative equals positive.