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

$-2i\sqrt 2$
Step 1: $-\sqrt -8$ Step 2: $-\sqrt (-1\times8)$ Step 3: $-(\sqrt -1\times\sqrt 8)$ Step 4: Since $\sqrt -1=i$, the expression becomes $-i\sqrt 8$ Step 5: $-i\sqrt (2\times4)$ Step 6: $-i\sqrt 2\sqrt 4$ Step 7: This is simplified to $-2i\sqrt 2$