## Algebra: A Combined Approach (4th Edition)

$i\sqrt 7$
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