9
Answer: CSet 3: Quadratic Equations (Beginner)
Explanation
PROBLEM
Solve: (x - 5) squared = 9. Find the positive solution.
Solve: (x - 5) squared = 9. Find the positive solution.
A.
9
B.
7
C.✓ Correct
8
D.
6
Detailed Explanation
Choice C is the best answer. Take square root: x - 5 = ±3. x = 5 + 3 = 8 or x = 5 - 3 = 2
Why others are wrong:
A: 9 is incorrect because it does not satisfy the equation.
B: 7 is incorrect because it does not satisfy the equation.
D: 6 is incorrect because it does not satisfy the equation.