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.

5x+40

5(x + 8)

7x - 49

7(x - 7)

18x + 9

9(2x + 1)

15x - 10

5(3x - 2)

step-by-step explanation:

for number one all you have to do is factor 5 out of 5x + 40

for number 2 factor 7 out of 7x - 49

for number three factor 9 out of 18x + 9

for number four factor 5 out of 15x - 10

21

step-by-step explanation: