Solve Using the Square Root Property x^2-54=0

$x^{2} - 54 = 0$

Step 1

Add $54$ to both sides of the equation.

$x^{2} = 54$

Step 2

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

$x = \pm \sqrt{54}$

Step 3

Simplify $\pm \sqrt{54}$ .

Rewrite $54$ as $3^{2} \cdot 6$ .

Factor $9$ out of $54$ .

$x = \pm \sqrt{9 (6)}$

Rewrite $9$ as $3^{2}$ .

$x = \pm \sqrt{3^{2} \cdot 6}$

Pull terms out from under the radical.

$x = \pm 3 \sqrt{6}$

Step 4

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

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

$x = 3 \sqrt{6}$

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

$x = - 3 \sqrt{6}$

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

$x = 3 \sqrt{6}, - 3 \sqrt{6}$

Step 5

The result can be shown in multiple forms.

Exact Form:

$x = 3 \sqrt{6}, - 3 \sqrt{6}$

Decimal Form:

$x = 7.34846922 \dots, - 7.34846922 \dots$