Posted by Clair on Tuesday, December 8, 2009 at 11:38pm.
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  Reiny, Tuesday, December 8, 2009 at 11:49pm
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  Clair, Tuesday, December 8, 2009 at 11:53pm
Thanks!
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