The vertex of the parabola y = x² − 6x + 8 is at: A (6, 8) B (3, −1) C (−3, 1) D (2, 0) ✓ Correct Answer: Option B x_vertex = −b/(2a) = 6/2 = 3. y = 9 − 18 + 8 = −1. Vertex at (3, −1). Practice CLEP Exam Prep Quizzes → Browse All Questions Study Flashcards