how do you find the vertex of a parabola

Question

hero · Answer

1. In order to find the vertex of a parabola, we first need a quadratic equation. Do you have one?

anonymous · Answer

i have three points (-2,2), (0,1),(1,-2.5)

hero · Answer

You have three points that are on the parabola?

anonymous · Answer

yes

hero · Answer

Hmm, interesting. All you were given were those three points?

anonymous · Answer

yes

hero · Answer

Hang on a second...

hero · Answer

I did a quadratic fit, and it returned the following quadratic:

$$y = -x^2 -2.5x + 1$$. Is that the quadratic you're supposed to be working with?

hero · Answer

Seems like you had to find a lot more than just the  vertex of a parabola if that's the case.

anonymous · Answer

trying to find expressions for the quadratic function with those points, I have a graph with those points.

hero · Answer

Okay, so your question was wrong then. Your original question should have been, "How do I find a quadratic function if given the following points: (-2,2), (0,1),(1,-2.5)?". If you're going to post a question, you should at least be aware of what question to ask.

anonymous · Answer

now that we have that taken care if  what do I do now

anonymous · Answer

of not if

amistre64 · Answer

you have a graph of a parabola with those points?