Algebra: A Combined Approach (4th Edition)

$10i$
Step 1: $\sqrt (-100)$ Step 2: $\sqrt (-1\times100)$ Step 3: $\sqrt -1 \times \sqrt 100$ Step 4: Since $\sqrt -1=i$ and $\sqrt 100=10$, the expression becomes $i\times10$ Step 5: Simplifying, the final answer is $10i$