Precalculus Examples

${(x + 6)}^{2} = 49$

Step 1

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

$x + 6 = \pm \sqrt{49}$

Step 2

Simplify $\pm \sqrt{49}$ .

Tap for more steps...

Step 2.1

Rewrite $49$ as $7^{2}$ .

$x + 6 = \pm \sqrt{7^{2}}$

Step 2.2

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

$x + 6 = \pm 7$

Step 3

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

Tap for more steps...

Step 3.1

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

$x + 6 = 7$

Step 3.2

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

Tap for more steps...

Step 3.2.1

Subtract $6$ from both sides of the equation.

$x = 7 - 6$

Step 3.2.2

Subtract $6$ from $7$ .

$x = 1$

Step 3.3

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

$x + 6 = - 7$

Step 3.4

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

Tap for more steps...

Step 3.4.1

Subtract $6$ from both sides of the equation.

$x = - 7 - 6$

Step 3.4.2

Subtract $6$ from $- 7$ .

$x = - 13$

Step 3.5

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

$x = 1, - 13$