Evaluate square root of -16

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Algebra

$\sqrt{- 16}$

Rewrite $- 16$ as $- 1 (16)$ .

$\sqrt{- 1 (16)}$

Rewrite $\sqrt{- 1 (16)}$ as $\sqrt{- 1} \cdot \sqrt{16}$ .

$\sqrt{- 1} \cdot \sqrt{16}$

Rewrite $\sqrt{- 1}$ as $i$ .

$i \cdot \sqrt{16}$

Rewrite $16$ as $4^{2}$ .

$i \cdot \sqrt{4^{2}}$

Pull terms out from under the radical, assuming positive real numbers.

$i \cdot 4$

Move $4$ to the left of $i$ .

$4 i$

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