A comprehensive study of the sign
Open answerLet f(x) = -(x - 1)² + 4. Determine the vertex, the direction of variation and any roots, then fully analyse the sign of f(x) on R, justifying each step.
Let f(x) = -(x - 1)² + 4. Determine the vertex, the direction of variation and any roots, then fully analyse the sign of f(x) on R, justifying each step.