Algebra Examples

$x^{2} = 20$

Step 1

Take the specified root of both sides of the equation to eliminate the exponent on the left side.

$x = \pm \sqrt{20}$

Step 2

Simplify $\pm \sqrt{20}$ .

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Step 2.1

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

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Step 2.1.1

Factor $4$ out of $20$ .

$x = \pm \sqrt{4 (5)}$

Step 2.1.2

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

$x = \pm \sqrt{2^{2} \cdot 5}$

Step 2.2

Pull terms out from under the radical.

$x = \pm 2 \sqrt{5}$

Step 3

The complete solution is the result of both the positive and negative portions of the solution.

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Step 3.1

First, use the positive value of the $\pm$ to find the first solution.

$x = 2 \sqrt{5}$

Step 3.2

Next, use the negative value of the $\pm$ to find the second solution.

$x = - 2 \sqrt{5}$

Step 3.3

The complete solution is the result of both the positive and negative portions of the solution.

$x = 2 \sqrt{5}, - 2 \sqrt{5}$

Step 4

The result can be shown in multiple forms.

Exact Form:

$x = 2 \sqrt{5}, - 2 \sqrt{5}$

Decimal Form:

$x = 4.47213595 \dots, - 4.47213595 \dots$