The vertex is just a point — click it
No −b/2a, no substituting back. The answer is a coordinate.
1:49 · Nonlinear Functions
Worked in this video
f(x) = −2x² + 28x − 94
What is the vertex?
Type the function. The vertex is just the top of the parabola, so click it and Desmos labels the point. No −b/2a, and no substituting back to find the y.
Answer: (7, 4)