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