Question

Consider the quadratic function:
f(x) = x2 – 8x – 9

Vertex:
What is the vertex of the function?

Answer 1

f(x) = x^2 -8x -9 


x = -b/2a = 8/2 =4

y = 4^2 -8*4 -9 = 16 -32 -9 = 16 -41 = -25

so the wertex of this function will be (4,-25)

Answer 2

the answer is ( 4 , - 25 )

:)