Simplify (- square root of -8)( square root of -18)

$(- \sqrt{- 8}) (\sqrt{- 18})$

Step 1

Rewrite $- 8$ as $- 1 (8)$ .

$- \sqrt{- 1 (8)} \sqrt{- 18}$

Step 2

Rewrite $\sqrt{- 1 (8)}$ as $\sqrt{- 1} \cdot \sqrt{8}$ .

$- (\sqrt{- 1} \cdot \sqrt{8}) \sqrt{- 18}$

Step 3

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

$- (i \cdot \sqrt{8}) \sqrt{- 18}$

Step 4

Rewrite $- 18$ as $- 1 (18)$ .

$- (i \cdot \sqrt{8}) \sqrt{- 1 (18)}$

Step 5

Rewrite $\sqrt{- 1 (18)}$ as $\sqrt{- 1} \cdot \sqrt{18}$ .

$- (i \cdot \sqrt{8}) (\sqrt{- 1} \cdot \sqrt{18})$

Step 6

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

$- (i \cdot \sqrt{8}) (i \cdot \sqrt{18})$

Step 7

Rewrite $8$ as $2^{2} \cdot 2$ .

Factor $4$ out of $8$ .

$- (i \cdot \sqrt{4 (2)}) (i \cdot \sqrt{18})$

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

$- (i \cdot \sqrt{2^{2} \cdot 2}) (i \cdot \sqrt{18})$

Step 8

Pull terms out from under the radical.

$- (i \cdot (2 \sqrt{2})) (i \cdot \sqrt{18})$

Step 9

Simplify the expression.

Move $2$ to the left of $i$ .

$- (2 \cdot i \sqrt{2}) (i \cdot \sqrt{18})$

Multiply $2$ by $- 1$ .

$- 2 (i \sqrt{2}) (i \cdot \sqrt{18})$

Step 10

Rewrite $18$ as $3^{2} \cdot 2$ .

Factor $9$ out of $18$ .

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

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

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

Step 11

Pull terms out from under the radical.

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

Step 12

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

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

Step 13

Multiply $- 2 i \sqrt{2} (3 i \sqrt{2})$ .

Multiply $3$ by $- 2$ .

$- 6 i \sqrt{2} (i \sqrt{2})$

Raise $i$ to the power of $1$ .

$- 6 (i^{1} i) \sqrt{2} \sqrt{2}$

Raise $i$ to the power of $1$ .

$- 6 (i^{1} i^{1}) \sqrt{2} \sqrt{2}$

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$- 6 i^{1 + 1} \sqrt{2} \sqrt{2}$

Add $1$ and $1$ .

$- 6 i^{2} \sqrt{2} \sqrt{2}$

Raise $\sqrt{2}$ to the power of $1$ .

$- 6 i^{2} ({\sqrt{2}}^{1} \sqrt{2})$

Raise $\sqrt{2}$ to the power of $1$ .

$- 6 i^{2} ({\sqrt{2}}^{1} {\sqrt{2}}^{1})$

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$- 6 i^{2} {\sqrt{2}}^{1 + 1}$

Add $1$ and $1$ .

$- 6 i^{2} {\sqrt{2}}^{2}$

Step 14

Rewrite $i^{2}$ as $- 1$ .

$- 6 \cdot - 1 {\sqrt{2}}^{2}$

Step 15

Multiply $- 6$ by $- 1$ .

$6 {\sqrt{2}}^{2}$

Step 16

Rewrite ${\sqrt{2}}^{2}$ as $2$ .

Use $\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite $\sqrt{2}$ as $2^{\frac{1}{2}}$ .

$6 {(2^{\frac{1}{2}})}^{2}$

Apply the power rule and multiply exponents, ${(a^{m})}^{n} = a^{m n}$ .

$6 \cdot 2^{\frac{1}{2} \cdot 2}$

Combine $\frac{1}{2}$ and $2$ .

$6 \cdot 2^{\frac{2}{2}}$

Cancel the common factor of $2$ .

Cancel the common factor.

$6 \cdot 2^{\frac{2}{2}}$

Rewrite the expression.

$6 \cdot 2^{1}$

Evaluate the exponent.

$6 \cdot 2$

Step 17

Multiply $6$ by $2$ .

$12$

Simplify (- square root of -8)( square root of -18)

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