Solve Using the Square Root Property (7x-2)^2=49

${(7 x - 2)}^{2} = 49$

Step 1

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

$7 x - 2 = \pm \sqrt{49}$

Step 2

Simplify $\pm \sqrt{49}$ .

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

$7 x - 2 = \pm \sqrt{7^{2}}$

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

$7 x - 2 = \pm 7$

Step 3

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.

$7 x - 2 = 7$

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

Add $2$ to both sides of the equation.

$7 x = 7 + 2$

Add $7$ and $2$ .

$7 x = 9$

Divide each term in $7 x = 9$ by $7$ and simplify.

Divide each term in $7 x = 9$ by $7$ .

$\frac{7 x}{7} = \frac{9}{7}$

Simplify the left side.

Cancel the common factor of $7$ .

Cancel the common factor.

$\frac{7 x}{7} = \frac{9}{7}$

Divide $x$ by $1$ .

$x = \frac{9}{7}$

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

$7 x - 2 = - 7$

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

Add $2$ to both sides of the equation.

$7 x = - 7 + 2$

Add $- 7$ and $2$ .

$7 x = - 5$

Divide each term in $7 x = - 5$ by $7$ and simplify.

Divide each term in $7 x = - 5$ by $7$ .

$\frac{7 x}{7} = \frac{- 5}{7}$

Simplify the left side.

Cancel the common factor of $7$ .

Cancel the common factor.

$\frac{7 x}{7} = \frac{- 5}{7}$

Divide $x$ by $1$ .

$x = \frac{- 5}{7}$

Simplify the right side.

Move the negative in front of the fraction.

$x = - \frac{5}{7}$

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

$x = \frac{9}{7}, - \frac{5}{7}$

Solve Using the Square Root Property (7x-2)^2=49

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