Rachel T.

asked • 08/25/17

(3xy)^-1 if x=9 and y=-8

what is the value of the given expression if x=9 and y=-8

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Arturo O. answered • 08/25/17

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It looks like the problem was changed after Michael posted his answer.
 
(3xy)-1 = 1 / (3xy) = 1 / [3(9)(-8)] = - 1 / 216
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Rachel T.

I had put that as my answer but I was told that there was no negative exponents in the answer.
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08/25/17

Arturo O.

For the problem as currently stated, the answer is correct.  Note there is no negative exponent in the answer, since
 
(3xy)-1 = 3-1x-1y-1 = 1 / (3xy)
 
Moving the quantities with negative exponents to the denominator makes the exponents positive.
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08/25/17

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