Solve for x: x² + 0x - 9 = 0
Difficulty: Medium
About this MCQ
Medium GMAT item. Correct choice: D. x = 3 or x = -3.
- A. x = -3 or x = 3
Why not A: “x = -3 or x = 3” is not x = 3 or x = -3.
- B. x = 4 or x = -4
Why not B: “x = 4 or x = -4” is not x = 3 or x = -3.
- C. x = 3 or x = -2
Why not C: “x = 3 or x = -2” is not x = 3 or x = -3.
- D. x = 3 or x = -3 ✓
Correct answer
D. x = 3 or x = -3
Explanation
x = 3 or x = -3 (option D) is the accepted answer to “Solve for x: x² + 0x - 9 = 0”. Option A (x = -3 or x = 3) is a different value from x = 3 or x = -3. Option B (x = 4 or x = -4) is a different value from x = 3 or x = -3. Option C (x = 3 or x = -2) is a different value from x = 3 or x = -3. Keep x = 3 or x = -3 as the GMAT fact for this stem.
Source: Original practice question, MCQsHub
Tags: Math, Algebra, American Exams, GMAT
Submitted by: MCQsHub Editorial
Related MCQs
- What is 60% of 340?
- What is the greatest common factor (GCF) of 28 and 7?
- A company's profit margin is 30% of its 0,000 revenue. What are the total costs?
- A jar contains only red and blue marbles in a ratio of 3:2. If there are 16 blue marbles, how many red marbles...
- Solve for x: x² - 9x + 18 = 0
- A car travels at 75 miles per hour. How far does it travel in 4 hours?