hi all

i got some h/w for negative powers teatcher said :

X^-a = 1/X^a

why is that?(Wondering)

thanks.....

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- Sep 8th 2008, 11:48 PMspik31indices laws negative powers
hi all

i got some h/w for negative powers teatcher said :

X^-a = 1/X^a

why is that?(Wondering)

thanks..... - Sep 9th 2008, 12:00 AMo_O
Raising a number to -1 will produce its reciprocal: (this is just how it is defined)

So: - Sep 9th 2008, 12:27 AMbkarpuz
Because, it is defined to be

letting , we get

which indicates

privided that . - Sep 9th 2008, 05:07 AMspik31
In english plz ?? (Speechless)(Worried)

That be a great help scince im only startin gcse's :)

thanks all... - Oct 2nd 2008, 11:56 PMCaptainBlack