6-3 =1/63 =1/216
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19
An expression with a negative exponent is equivalent to the positive exponent of its reciprocal. Thus, 3-4 = 1/34 or, equivalently, (1/3)4 or (3/4)-2 = (4/3)2
Polynomials cannot have negative exponent.
5
3-2 = 1/32 = 1/9