Solve for x: x² + 8x + 12 = 0
Difficulty: Medium
About this MCQ
Medium ACT item. Correct choice: D. x = -2 or x = -6.
- A. x = -2 or x = -5
Why not A: “x = -2 or x = -5” is not x = -2 or x = -6.
- B. x = -1 or x = -7
Why not B: “x = -1 or x = -7” is not x = -2 or x = -6.
- C. x = 2 or x = 6
Why not C: “x = 2 or x = 6” is not x = -2 or x = -6.
- D. x = -2 or x = -6 ✓
Correct answer
D. x = -2 or x = -6
Explanation
x = -2 or x = -6 (option D) is the accepted answer to “Solve for x: x² + 8x + 12 = 0”. Option A (x = -2 or x = -5) is a different value from x = -2 or x = -6. Option B (x = -1 or x = -7) is a different value from x = -2 or x = -6. Option C (x = 2 or x = 6) is a different value from x = -2 or x = -6. Keep x = -2 or x = -6 as the ACT fact for this stem.
Source: Original practice question, MCQsHub
Tags: Math, Algebra, American Exams, ACT
Submitted by: MCQsHub Editorial
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