Algebra Examples

$x^{2} + 9 = 73$

Step 1

Move all terms not containing $x$ to the right side of the equation.

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Step 1.1

Subtract $9$ from both sides of the equation.

$x^{2} = 73 - 9$

Step 1.2

Subtract $9$ from $73$ .

$x^{2} = 64$

Step 2

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

$x = \pm \sqrt{64}$

Step 3

Simplify $\pm \sqrt{64}$ .

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Step 3.1

Rewrite $64$ as $8^{2}$ .

$x = \pm \sqrt{8^{2}}$

Step 3.2

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

$x = \pm 8$

Step 4

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

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Step 4.1

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

$x = 8$

Step 4.2

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

$x = - 8$

Step 4.3

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

$x = 8, - 8$

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