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The reciprocal of a^(-x/y) is 1/a^(x/y). The fact that the exponent is a fraction makes no difference.
Polynomials cannot have negative exponent.
Take the first few points. y = x^3 x | y -------- 0 0 1 1 2 8 3 27 4 64 5 125 Don't forget there is also a negative side! Since the exponent is odd the y values will be negative! So it looks like: y a x i s | / / x axis / / | | |
A negative exponent is the reciprocal of the corresponding positive exponent. 102 = 100 10-2 = 1/100
Negative exponents indicate that the number for which the exponent applies to should be placed under one. Ex: 2^(-3) also can be expressed as 1/(2^3) or 1/8. So, to eliminate the negative exponent, simply place the number (and the accompanying exponent) under one to make a fraction.