What is the vertex of the function f(x) = x2 + 3x + ?

The vertex of the function is at x = -3/2. We cannot find the y value with an incomplete equation.

To find the x value of a vertex, we use the equation -b/2a, in which a is equal to the coefficient of x^2 (in this case 1) and b is equal to the coefficient of x (in this case 3).

-b/2a

-3/2(1)

-3/2

This gives us that value. To find the y value, you would plug this into the equation. Since this equation is not complete, you cannot do that yet.

hello from mrbilldoesmath!

answer:

x - 3

discussion:

x^2 - 9 = (x-3) (x+3)   so

(x^2-9)/ (x + 3) = x-3

you,

mrb

d

gimmee one of those gold crowns!

~coco