Precalculus Examples

$2 - \sqrt{- 27}$

Step 1

Rewrite $- 27$ as $- 1 (27)$ .

$2 - \sqrt{- 1 (27)}$

Step 2

Rewrite $\sqrt{- 1 (27)}$ as $\sqrt{- 1} \cdot \sqrt{27}$ .

$2 - (\sqrt{- 1} \cdot \sqrt{27})$

Step 3

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

$2 - (i \cdot \sqrt{27})$

Step 4

Rewrite $27$ as $3^{2} \cdot 3$ .

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Step 4.1

Factor $9$ out of $27$ .

$2 - (i \cdot \sqrt{9 (3)})$

Step 4.2

Rewrite $9$ as $3^{2}$ .

$2 - (i \cdot \sqrt{3^{2} \cdot 3})$

Step 5

Pull terms out from under the radical.

$2 - (i \cdot (3 \sqrt{3}))$

Step 6

Move $3$ to the left of $i$ .

$2 - (3 \cdot i \sqrt{3})$

Step 7

Multiply $3$ by $- 1$ .

$2 - 3 i \sqrt{3}$