Algebra Examples

$(\sqrt{- 72}) (\sqrt{- 2})$

Step 1

Rewrite $- 72$ as $- 1 (72)$ .

$\sqrt{- 1 (72)} \sqrt{- 2}$

Step 2

Rewrite $\sqrt{- 1 (72)}$ as $\sqrt{- 1} \cdot \sqrt{72}$ .

$\sqrt{- 1} \cdot \sqrt{72} \sqrt{- 2}$

Step 3

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

$i \cdot \sqrt{72} \sqrt{- 2}$

Step 4

Rewrite $- 2$ as $- 1 (2)$ .

$i \cdot \sqrt{72} \sqrt{- 1 (2)}$

Step 5

Rewrite $\sqrt{- 1 (2)}$ as $\sqrt{- 1} \cdot \sqrt{2}$ .

$i \cdot \sqrt{72} (\sqrt{- 1} \cdot \sqrt{2})$

Step 6

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

$i \cdot \sqrt{72} (i \cdot \sqrt{2})$

Step 7

Rewrite $72$ as $6^{2} \cdot 2$ .

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Step 7.1

Factor $36$ out of $72$ .

$i \cdot \sqrt{36 (2)} (i \cdot \sqrt{2})$

Step 7.2

Rewrite $36$ as $6^{2}$ .

$i \cdot \sqrt{6^{2} \cdot 2} (i \cdot \sqrt{2})$

Step 8

Pull terms out from under the radical.

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

Step 9

Move $6$ to the left of $i$ .

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

Step 10

Multiply $6 i \sqrt{2} (i \sqrt{2})$ .

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Step 10.1

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

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

Step 10.2

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

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

Step 10.3

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

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

Step 10.4

Add $1$ and $1$ .

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

Step 10.5

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

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

Step 10.6

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

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

Step 10.7

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

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

Step 10.8

Add $1$ and $1$ .

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

Step 11

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

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

Step 12

Multiply $6$ by $- 1$ .

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

Step 13

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

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Step 13.1

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

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

Step 13.2

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

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

Step 13.3

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

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

Step 13.4

Cancel the common factor of $2$ .

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Step 13.4.1

Cancel the common factor.

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

Step 13.4.2

Rewrite the expression.

$- 6 \cdot 2^{1}$

Step 13.5

Evaluate the exponent.

$- 6 \cdot 2$

Step 14

Multiply $- 6$ by $2$ .

$- 12$