Vertex?

Please clarify...
In vertex form, does k equal 2ac – b^2/2a or 4ac – b^2/2a? Which one?

Thanks!

Quote:

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Originally Posted by live_laugh_luv27

Please clarify...
In vertex form, does k equal 2ac – b^2/2a or 4ac – b^2/2a? Which one?

Thanks!

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we already solved this for you. look at your quadratic question here