1
Answer: CSet 1: Quadratic Equations (Beginner)
Explanation
PROBLEM
Solve: (x - 7) squared = 9. Find the positive solution.
Solve: (x - 7) squared = 9. Find the positive solution.
A.
9
B.
12
C.✓ Correct
10
D.
8
Detailed Explanation
Choice C is the best answer. Take square root: x - 7 = ±3. x = 7 + 3 = 10 or x = 7 - 3 = 4
Why others are wrong:
A: 9 is incorrect because it does not satisfy the equation.
B: 12 is incorrect because it does not satisfy the equation.
D: 8 is incorrect because it does not satisfy the equation.