Answer
$i\sqrt 7$
Work Step by Step
Step 1: $\sqrt -7$= $\sqrt -1\times\sqrt 7$
Step 2: Since $\sqrt -1=i$, the expression becomes $i\times\sqrt 7$
Step 3: $i\times\sqrt 7$ = $i\sqrt 7$
Step 4: No further simplification is possible
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