Solve for x: x² - 8x + 15 = 0
Difficulty: Medium
About this MCQ
Medium ACT item. Correct choice: B. x = 3 or x = 5.
- A. x = 4 or x = 4
Why not A: “x = 4 or x = 4” is not x = 3 or x = 5.
- B. x = 3 or x = 5 ✓
- C. x = 3 or x = 6
Why not C: “x = 3 or x = 6” is not x = 3 or x = 5.
- D. x = -3 or x = -5
Why not D: “x = -3 or x = -5” is not x = 3 or x = 5.
Correct answer
B. x = 3 or x = 5
Explanation
x = 3 or x = 5 (option B) is the accepted answer to “Solve for x: x² - 8x + 15 = 0”. Option A (x = 4 or x = 4) is a different value from x = 3 or x = 5. Option C (x = 3 or x = 6) is a different value from x = 3 or x = 5. Option D (x = -3 or x = -5) is a different value from x = 3 or x = 5. Keep x = 3 or x = 5 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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