Answer
$2-8i$
Work Step by Step
$\sqrt 4-\sqrt {-64}$
=$2-\sqrt {-1\times64}$
=$2-(\sqrt {-1}\times\sqrt {64})$
=$2-(i\times\sqrt {64})$
=$2-(i\times8)$
=$2-8i$
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.