ok guys, I gotta graph p= -X^2 + 85X - 550

ive got this far,

P= f(x)

f(x)= -X^2 + 85X - 550

= Y = -X^2 +85X - 550

a= -1 b=85 c=-550

vertex(x) = -b/2a = -(85)/2(-1) = -85/-2 = 42.5

then i started to plug it into the Y vertex and something dosen't seem right