Answer
$-10i$
Work Step by Step
$6i^{3}-4i^{5}=6i^{2}i-4i^{4}i=-6i-4i=-10i$
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.