CPM Homework Help : AC Problem 11-7

Jacob discovered that the $x$ -intercepts of a certain parabola are $\left(3, 0\right)$ and $\left(-1,0\right)$ , but now he needs to find the vertex. Can you get him started? What do you know about the vertex? Draw a sketch of this parabola to help you.

Hint 1:

Sketch the parabola on your graph paper first.

Hint 2:

Remember that parabolas are symmetric shapes and the vertex is on the line of symmetry.
Knowing this information, what part of the vertex do you know?