SOLUTION: graph the function using its vertex, axis of symmetry, and intercepts f(x)=-4x^2-24x

Algebra ->  Linear-equations -> SOLUTION: graph the function using its vertex, axis of symmetry, and intercepts f(x)=-4x^2-24x      Log On


   

Question 1030767: graph the function using its vertex, axis of symmetry, and intercepts
f(x)=-4x^2-24x
Answer by josgarithmetic(39616) About Me  (Show Source):
You can put this solution on YOUR website!
Easiest to first find the x-axis intercepts.

-4x%5E2-24x=0
x%5E2%2B6x=0
x%28x%2B6%29=0
x intercepts are 0 and -6.

The middle value between them is -3, which means the symmetry axis is x=-3.

To complete the vertex, what is f(-3)?