Algebra Examples

$- \sqrt{- 80}$

Step 1

Rewrite $- 80$ as $- 1 (80)$ .

$- \sqrt{- 1 (80)}$

Step 2

Rewrite $\sqrt{- 1 (80)}$ as $\sqrt{- 1} \cdot \sqrt{80}$ .

$- (\sqrt{- 1} \cdot \sqrt{80})$

Step 3

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

$- (i \cdot \sqrt{80})$

Step 4

Rewrite $80$ as $4^{2} \cdot 5$ .

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Step 4.1

Factor $16$ out of $80$ .

$- (i \cdot \sqrt{16 (5)})$

Step 4.2

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

$- (i \cdot \sqrt{4^{2} \cdot 5})$

Step 5

Pull terms out from under the radical.

$- (i \cdot (4 \sqrt{5}))$

Step 6

Simplify the expression.

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Step 6.1

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

$- (4 \cdot i \sqrt{5})$

Step 6.2

Multiply $4$ by $- 1$ .

$- 4 i \sqrt{5}$