Question

What are the coordinates of the vertex for f(x) = 2x2 + 4x + 9?

Answer 1

Vertex: (-1,7)
Focus: (-1, 57 over 8)
Axis of Symmetry(AOS): x=-1
Directories: y= 55 over 8
X , Y
-3 , 15
-2 , 9
-1 , 7
0 , 9
1 , 5

Answer 2

Your equation
`f(x)=2x^2+4x+9` is in the form
`y=ax^2+bx+c`
The vertex only relies on "a" and "b" though, so that +9 doesn't really matter in this case. The vertex of a parabola is located where

`x=(-b)/(2a)=(-4)/(2(2))=-1`
So your x-coordinate is -1. You need to find f(-1) to find your y-coordinate, and then you list it in the form (-1, y).