# Math

posted by .

I need help in finding the vertex of a parabola using an equation in this form: Ax^2 + Bx+C
I have a test on this tomorrow.
For example: 3x^2 +1x - 2
How would I find the vertex in this?

• Math -

Unless you are instructed to do it in a certain way, here is the simplest and quickest way:
For any parabola in the form
y + Ax^2 + Bx + C
the x of the vertex is -B/(2A)
so in our case -1/3
You then sub that back into your equation to find the y of the vertex,
for ours ...
y = 3(1/9) + 1/3 - 2 = 2/3 - 2
= -4/3

Let me know if this answers is sufficient.

• Math -

Thanks!

## Similar Questions

1. ### Alg 2 (ASAP)

I have a parabola vertex (11,3) p is not given, focus pt is not given. I need to find the equation of the parabola. How would I do this w/o p value or focus pt?
2. ### 9th. algebra

how can I figure out the formula. example. I need to transform the following equation y = x2 + 4 - 8 into vertex form and then I need to state the coordinates of the vertex of the parabola. I forgot how to arrive at the answer
3. ### algebra

I would like to have some help on this problem please. I'm so post to find the vertex and axis of the parabola.Does anyone have an idea?
4. ### math-geometry

we have a test tomorrow and she said that a problem like this is going to be on there how do you do it?
5. ### Algebra 1 parabola's

I have a graph with a parabola on it and asked to write the function for f(x) in standard form. I know that standard is y=ax^2+bx+c obviously, since the points are on the graph we know x and y so a,b and c need to be found. The vertex …
6. ### Math

Using the following information for the Vertex and Directrix, write the standard form equation for the parabola with what is given below. Vertex: (-2,1) Directrix: x=1
7. ### algebra

Suppose a parabola has vertex (-4,7) and also passes through the point (-3,8), write the equation of the parabola in vertex form.
8. ### algebra 2

A quadratic equation can be written in vertex form or in standard form. Sometimes one form is more beneficial than the other. Identify which form would be more helpful if you needed to do each task listed below and explain why a. factor …
9. ### Algebra2

A quadratic equation can be written in vertex form or in standard form. Sometimes one form is more beneficial than the other. Identify which form would be more helpful if you needed to do each task listed below and explain why. a- …
10. ### Algebra

Can you please help me with the below question: The vertex of a parabola is located at (-12, -1). The parabola also passes through the point (-10, 5). Write the equation of this parabola in both vertex form and standard form. Vertex …

More Similar Questions