Solve for x: x² + 3x - 18 = 0
Difficulty: Medium
About this MCQ
Medium SAT item. Correct choice: D. x = 3 or x = -6.
- A. x = 3 or x = -5
Why not A: “x = 3 or x = -5” is not x = 3 or x = -6.
- B. x = 4 or x = -7
Why not B: “x = 4 or x = -7” is not x = 3 or x = -6.
- C. x = -3 or x = 6
Why not C: “x = -3 or x = 6” is not x = 3 or x = -6.
- D. x = 3 or x = -6 ✓
Correct answer
D. x = 3 or x = -6
Explanation
x = 3 or x = -6 (option D) is the accepted answer to “Solve for x: x² + 3x - 18 = 0”. Option A (x = 3 or x = -5) is a different value from x = 3 or x = -6. Option B (x = 4 or x = -7) is a different value from x = 3 or x = -6. Option C (x = -3 or x = 6) is a different value from x = 3 or x = -6. Keep x = 3 or x = -6 as the SAT fact for this stem.
Source: Original practice question, MCQsHub
Tags: SAT, Math, Algebra, American Exams
Submitted by: MCQsHub Editorial
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