Question

divide. assume that all variables in any denominator are nonzero. z^3/z^7

Answer 1

\[\frac{ z^{a} }{ z^{b} } = z^{a-b}\]

Answer 2

you may use also
\[z^{-c} = \frac{ 1 }{ z^{c} }\]

Answer 3

\[z ^{-b} = \frac{ 1 }{ z^b }\]