Solve for x: x² + 3x - 18 = 0
- A. x = 3 or x = -5
- B. x = 4 or x = -7
- C. x = -3 or x = 6
- D. x = 3 or x = -6 ✓
Correct answer
D. x = 3 or x = -6
Explanation
Factor the quadratic: (x - 3)(x - -6) = 0, so x = 3 or x = -6.
D. x = 3 or x = -6
Factor the quadratic: (x - 3)(x - -6) = 0, so x = 3 or x = -6.