Set 2: Quadratic Equations (Beginner)

[Variation 1] **Choice A is the best answer.** Take square root: x - 7 = ±3. x = 7 + 3 = 10 or x = 7 - 3 = 4

Explanation

Answer: A

PROBLEM

Recent studies show that solve: (x - 7) squared = 9. Find the positive solution.

Solve: (x - 7) squared = 9. Find the positive solution.

✓ Correct

Detailed Explanation

[Variation 1] Choice A is the best answer. Take square root: x - 7 = ±3. x = 7 + 3 = 10 or x = 7 - 3 = 4

Why others are wrong:

B: 11 is incorrect because it does not satisfy the equation.

C: 12 is incorrect because it does not satisfy the equation.

D: 20 is incorrect because it does not satisfy the equation.