Algebra Examples

$\sqrt{12} - 5 \sqrt{8} - 7 \sqrt{20}$

Step 1

Rewrite $12$ as $2^{2} \cdot 3$ .

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Step 1.1

Factor $4$ out of $12$ .

$\sqrt{4 (3)} - 5 \sqrt{8} - 7 \sqrt{20}$

Step 1.2

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

$\sqrt{2^{2} \cdot 3} - 5 \sqrt{8} - 7 \sqrt{20}$

Step 2

Pull terms out from under the radical.

$| 2 | \sqrt{3} - 5 \sqrt{8} - 7 \sqrt{20}$

Step 3

The absolute value is the distance between a number and zero. The distance between $0$ and $2$ is $2$ .

$2 \sqrt{3} - 5 \sqrt{8} - 7 \sqrt{20}$

Step 4

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

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Step 4.1

Factor $4$ out of $8$ .

$2 \sqrt{3} - 5 \sqrt{4 (2)} - 7 \sqrt{20}$

Step 4.2

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

$2 \sqrt{3} - 5 \sqrt{2^{2} \cdot 2} - 7 \sqrt{20}$

Step 5

Pull terms out from under the radical.

$2 \sqrt{3} - 5 (| 2 | \sqrt{2}) - 7 \sqrt{20}$

Step 6

The absolute value is the distance between a number and zero. The distance between $0$ and $2$ is $2$ .

$2 \sqrt{3} - 5 (2 \sqrt{2}) - 7 \sqrt{20}$

Step 7

Multiply $2$ by $- 5$ .

$2 \sqrt{3} - 10 \sqrt{2} - 7 \sqrt{20}$

Step 8

Rewrite $20$ as $2^{2} \cdot 5$ .

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Step 8.1

Factor $4$ out of $20$ .

$2 \sqrt{3} - 10 \sqrt{2} - 7 \sqrt{4 (5)}$

Step 8.2

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

$2 \sqrt{3} - 10 \sqrt{2} - 7 \sqrt{2^{2} \cdot 5}$

Step 9

Pull terms out from under the radical.

$2 \sqrt{3} - 10 \sqrt{2} - 7 (| 2 | \sqrt{5})$

Step 10

The absolute value is the distance between a number and zero. The distance between $0$ and $2$ is $2$ .

$2 \sqrt{3} - 10 \sqrt{2} - 7 (2 \sqrt{5})$

Step 11

Multiply $2$ by $- 7$ .

$2 \sqrt{3} - 10 \sqrt{2} - 14 \sqrt{5}$

Step 12

The result can be shown in multiple forms.

Exact Form:

$2 \sqrt{3} - 10 \sqrt{2} - 14 \sqrt{5}$

Decimal Form:

$- 41.98298569 \dots$