Solve for x: x² - 1x - 30 = 0
Difficulty: Medium
About this MCQ
Medium GMAT item. Correct choice: A. x = -5 or x = 6.
- A. x = -5 or x = 6 ✓
- B. x = -5 or x = 7
Why not B: “x = -5 or x = 7” is not x = -5 or x = 6.
- C. x = -4 or x = 5
Why not C: “x = -4 or x = 5” is not x = -5 or x = 6.
- D. x = 5 or x = -6
Why not D: “x = 5 or x = -6” is not x = -5 or x = 6.
Correct answer
A. x = -5 or x = 6
Explanation
x = -5 or x = 6 (option A) is the accepted answer to “Solve for x: x² - 1x - 30 = 0”. Option B (x = -5 or x = 7) is a different value from x = -5 or x = 6. Option C (x = -4 or x = 5) is a different value from x = -5 or x = 6. Option D (x = 5 or x = -6) is a different value from x = -5 or x = 6. Keep x = -5 or x = 6 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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