What is the y-value of the vertex of the function f(x) = –(x – 3)(x + 11)?

the y-value of the vertex is

49.

Step-by-step explanation:

We have been a function . We are asked to find the y-value of vertex of the given function.  

Upon multiplying both factors, we will get,

Now, we  will use formula to find the x-coordinate of vertex of parabola.

Since the x-coordinate of vertex of parabola is , so we will substitute in our equation to find y-coordinate of parabola.

Therefore, the y-coordinate of vertex of the given parabola is 49.