Algebra Examples

x^{2} = 9

$x^{2} = 9$

Step 1

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

x = \pm \sqrt{9}

$x = \pm \sqrt{9}$

Step 2

Simplify

\pm \sqrt{9}

$\pm \sqrt{9}$ .

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Step 2.1

Rewrite

9

$9$ as

3^{2}

$3^{2}$ .

x = \pm \sqrt{3^{2}}

$x = \pm \sqrt{3^{2}}$

Step 2.2

Pull terms out from under the radical, assuming positive real numbers.

x = \pm 3

$x = \pm 3$

x = \pm 3

$x = \pm 3$

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

$\pm$ to find the first solution.

x = 3

$x = 3$

Step 3.2

Next, use the negative value of the

\pm

$\pm$ to find the second solution.

x = - 3

$x = - 3$

Step 3.3

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

x = 3, - 3

$x = 3, - 3$

x = 3, - 3

$x = 3, - 3$