Solve for r r^2=1

$r^{2} = 1$

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

$r = \pm \sqrt{1}$

Any root of $1$ is $1$ .

$r = \pm 1$

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.

$r = 1$

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

$r = - 1$

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

$r = 1, - 1$