Algebra-2

Question Analysis
This problem assesses the ability to solve a square root equation with an additional constant term by isolating the radical and squaring both sides.

Key Concept Explanation
To solve a square root equation with an additional constant term, first isolate the radical on one side and then square both sides to eliminate the square root. Finally, solve the resulting linear equation.

Step-by-step Solution
1. Isolate the radical:
2. Subtract 2 from both sides:
3. Square both sides:
4. Simplify: