Solve the equation $$9x^2 - 81 = 0$$ . The solutions are $$x...

Question Analysis
This problem assesses the student's ability to solve a quadratic equation by isolating and then using the square root method.

Key Concept Explanation
The square root method requires isolating on one side of the equation before taking the square root of both sides. The solutions include both the positive and negative roots.

Step-by-step Solution
1. Given the equation:
2. Add 81 to both sides:
3. Divid...