Answer
$\color{blue}{z^{-1/2}(9+2z)}$
Work Step by Step
The least exponent of the variable is $-1/2$.
Factor out $z^{-1/2}$ to obtain:
$=\color{blue}{z^{-1/2}(9+2z)}$
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.