9. Roots, Radicals, and Complex Numbers

Simplify the root.

${}^4\sqrt{256}$

Determine if the given square root evaluates to a real number.

$\sqrt{-64}$

Simplify the following.

${}^4\sqrt{x^4{y}^8}$

Simplify the root.

${-}^5\sqrt{1024}$

Determine if the given square root evaluates to a real number.

$-\sqrt{4}$

Simplify the root.

${}^3\sqrt{-125}$