Posted by **Sejul** on Thursday, October 6, 2011 at 11:56pm.

Can you use algebra to find a quadratic equation if your know the coordinates of just ONE point on its graph?

Can you use algebra to find a quadratic equation if your know the coordinates of just TWO points on its graph?

If so, what information is needed?

- algebra -
**Anonymous**, Friday, October 7, 2011 at 12:48am
You mus know 3 coordinats if you want find a quadratic equation.

- algebra -
**Steve**, Friday, October 7, 2011 at 10:37am
In general, you need three points, but if you know that one of the points is the vertex, then that gives you extra information. If you know (h,k), then the parabola is

y-k = a(x-h)^2

so only "a" is unknown. The second point will provide that.

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