Respuesta :

jhonyy9
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)
corinaco

the answer is ( 4 , - 25 )

:)