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I'm having trouble understanding this, please help.

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Why is -4^-1 equal to -1/4?
 Aug 5, 2013

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 #1
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(-4)^(-1) is just another notation of a multiplicative inverse number.
For instance:
a^3 = a*a*a
a^(-3) = 1/(a*a*a) = 1/a^3
 Aug 6, 2013

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