Question

Simplify z^-9 by making the exponent possitive.

I got z^9, is that correct?

Answer 1

what you would have to know is that \[a ^{-b}=\frac{ 1 }{ a ^{b} }\]

Answer 2

if you apply that fact to your question, what do you get as your answer??

Answer 3

you can't just change the sign from -9 to +9 without "compensating"
in other words, flip the fraction

Answer 4

exactly, just follow that formula as @kausarsalley gave you.

Answer 5

okay so wouldnt it be z^9 and that it, or is their more to it?

Answer 6

1/z^9 don't you mean ?

Answer 7

@katlin95 no, it wouldn't be. look at the formula and apply it to your problem.
z^-9 = 1/z^9

Answer 8

oh alright:)

Answer 9

If this is a bit fuzzy, you might look at
http://www.khanacademy.org/math/arithmetic/exponents-radicals/world-of-exponents/v/zero--negative--and-fractional-exponents