Question

find the maximum y-value on the graph of y=f(x)
f(x) =-x^2+8x+1
the maximum y-value is y=

Answer 1

the maximum value is the vertex of the graph when the leading coefficient is negative.
you can solve that in two different ways
a short cut method of (-b/2a, y)
the longer but neater method is completing the square.

Answer 2

im so last

Answer 3

last at what?

Answer 4

all