SOLUTION: What is the x-coordinate of the vertex of a parabola defined by the function f(x) = -7x2 + 9x + 8.

Algebra ->  Quadratic Equations and Parabolas -> SOLUTION: What is the x-coordinate of the vertex of a parabola defined by the function f(x) = -7x2 + 9x + 8.      Log On


   

Question 888584: What is the x-coordinate of the vertex of a parabola defined by the function f(x) = -7x2 + 9x + 8.
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
f(x) = -7x^2 + 9x + 8 ---> a = -7, b = 9, c = 8


x = -b/(2a)

x = -9/(2*(-7))

x = 9/14