Question 758037
a to the 1/2 power over a^2 
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a^(1/2)/a^2
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You may subtract exponents in either direction.
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= a^(1/2 -2) = a^(-3/2)
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OR
= 1/[a^(2-(1/2)] = 1/a^(3/2)
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Most instructors prefer the answer with positive exponents.
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cheers,
Stan H.