## Intermediate Algebra for College Students (7th Edition)

$10i$
Factor the radicand so that one factor is a perfect square while the other factor is $-1$ to obtain: $=\sqrt{100(-1)} \\=\sqrt{10^2(-1)}$ Simplify to obtain: $=10\sqrt{-1}$ RECALL: $\sqrt{-1} = i$ Use the ruile above to obtain: $=10i$