Tuesday

November 25, 2014

November 25, 2014

Posted by **Clair** on Tuesday, December 8, 2009 at 11:38pm.

I have a test on this tomorrow.

For example: 3x^2 +1x - 2

How would I find the vertex in this?

- Math -
**Reiny**, Tuesday, December 8, 2009 at 11:49pmUnless 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 -
**Clair**, Tuesday, December 8, 2009 at 11:53pmThanks!

**Answer this Question**

**Related Questions**

9th. algebra - how can I figure out the formula. example. I need to transform ...

math-geometry - we have a test tomorrow and she said that a problem like this is...

Algebra 1 parabola's - I have a graph with a parabola on it and asked to write ...

algebra - Suppose a parabola has a vertex (-4,7) and also passes through the ...

math - the points (-9,0) and (19,0) lie on parabola. a.) determine an equation ...

Alg II/Trig - A parabola has a vertex at (0,0); a horizontal axis; and the point...

math - A parabola has the equation y = 4(x-3)^2-7 Choose 2 true statements: A) ...

math - A parabola has the equation y = 4(x-3)^2-7 Choose 2 true statements: A) ...

Alg 2 (ASAP) - I have a parabola vertex (11,3) p is not given, focus pt is not ...

math - 1 identify the coordinates of the vertex and the equation of the axis of ...