Solve for x: x² - 2x - 63 = 0
Difficulty: Medium
About this MCQ
Medium GMAT item. Correct choice: A. x = 9 or x = -7.
- A. x = 9 or x = -7 ✓
- B. x = 10 or x = -8
Why not B: “x = 10 or x = -8” is not x = 9 or x = -7.
- C. x = -9 or x = 7
Why not C: “x = -9 or x = 7” is not x = 9 or x = -7.
- D. x = 9 or x = -6
Why not D: “x = 9 or x = -6” is not x = 9 or x = -7.
Correct answer
A. x = 9 or x = -7
Explanation
x = 9 or x = -7 (option A) is the accepted answer to “Solve for x: x² - 2x - 63 = 0”. Option B (x = 10 or x = -8) is a different value from x = 9 or x = -7. Option C (x = -9 or x = 7) is a different value from x = 9 or x = -7. Option D (x = 9 or x = -6) is a different value from x = 9 or x = -7. Keep x = 9 or x = -7 as the GMAT fact for this stem.
Source: Original practice question, MCQsHub
Tags: Math, Algebra, American Exams, GMAT
Submitted by: MCQsHub Editorial
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