We have that the quadratic expression is given by:
If we apply the square root to both sides of the equation, we have:
As we can see, we will have two solutions. Then, we have:
Then, we have the two possible solutions as follows:
And we need to solve for both of them as follows:
First case
1. We need to add 6 to both sides of the equation:
Second case
2. We need to add 6 to both sides of the equation:
Therefore, in summary, the exact answers are x = 9, and x = 3.