Solve for x: x² - 9x + 8 = 0
Difficulty: Medium
About this MCQ
Medium GMAT item. Correct choice: C. x = 8 or x = 1.
- A. x = 9 or x = 0
Why not A: “x = 9 or x = 0” is not x = 8 or x = 1.
- B. x = 8 or x = 2
Why not B: “x = 8 or x = 2” is not x = 8 or x = 1.
- C. x = 8 or x = 1 ✓
- D. x = -8 or x = -1
Why not D: “x = -8 or x = -1” is not x = 8 or x = 1.
Correct answer
C. x = 8 or x = 1
Explanation
x = 8 or x = 1 (option C) is the accepted answer to “Solve for x: x² - 9x + 8 = 0”. Option A (x = 9 or x = 0) is a different value from x = 8 or x = 1. Option B (x = 8 or x = 2) is a different value from x = 8 or x = 1. Option D (x = -8 or x = -1) is a different value from x = 8 or x = 1. Keep x = 8 or x = 1 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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