A function is defined as f(x) = −x² + 4x − 3. What is the maximum value?
✓ Correct Answer: Option A
Vertex x = −b/(2a) = −4/(−2) = 2. f(2) = −4 + 8 − 3 = 1. Since a < 0, vertex is the max.
Vertex x = −b/(2a) = −4/(−2) = 2. f(2) = −4 + 8 − 3 = 1. Since a < 0, vertex is the max.