Consider the quadratic function:
f(x) = x2 – 8x – 9
vertex: (startfraction negative b over 2 a endfraction, f (startfraction negative b over 2 a))
what is the vertex of the function?
(
,
)

vertex is (4,-25)

Step-by-step explanation:

To find out the vertex we use formula

From the given f(x), the value of a=1, b=-8 and c=-9

Plug in the values in the formula

x=4

Now find the value of y

plug in 4 for x in f(x)

The value of y is -25

The vertex is (4,-25)

vertex = (4, - 25 )

Step-by-step explanation:

Given a quadratic function in standard form : f(x) = ax² + bx + c : a ≠ 0

The the x- coordinate of the vertex is

= -

f(x) = x² - 8x - 9 ← is in standard form

with a = 1, b = - 8, thus

= - = 4

Substitute x = 4 into f(x) for corresponding value of y

f(4) = 4² - 8(4) - 9 = 16 - 32 - 9 = - 25

vertex = (4, - 25 )

i get you, what you should do is think of the positive things that would come out of it. it will make yours parents proud and raise your grade. you should always try and if you can't focus tell the teacher.

16

step-by-step explanation: