7
Answer: CSet 5: Quadratic Equations (Beginner)
Explanation
PROBLEM
Solve: (x - 7) squared = 16. Find the positive solution.
Solve: (x - 7) squared = 16. Find the positive solution.
A.
13
B.
10
C.✓ Correct
11
D.
22
Detailed Explanation
Choice C is the best answer. Take square root: x - 7 = ±4. x = 7 + 4 = 11 or x = 7 - 4 = 3
Why others are wrong:
A: 13 is incorrect because it does not satisfy the equation.
B: 10 is incorrect because it does not satisfy the equation.
D: 22 is incorrect because it does not satisfy the equation.