Take the square root of each side of the equation to set up the solution for

Remove the perfect root factor under the radical to solve for .

Rewrite as .

Rewrite as .

Rewrite as .

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

Add to both sides of the equation.

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

Add to both sides of the equation.

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

Solve Using the Square Root Property (r-9)^2=-2