2
Answer: DSet 2: Quadratic Equations (Beginner)
Explanation
PROBLEM
Solve: (x - 7) squared = 4. Find the positive solution.
Solve: (x - 7) squared = 4. Find the positive solution.
A.
11
B.
18
C.
10
D.✓ Correct
9
Detailed Explanation
Choice D is the best answer. Take square root: x - 7 = ±2. x = 7 + 2 = 9 or x = 7 - 2 = 5
Why others are wrong:
A: 11 is incorrect because it does not satisfy the equation.
B: 18 is incorrect because it does not satisfy the equation.
C: 10 is incorrect because it does not satisfy the equation.