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Or, if x=0 is the vertex (of a parabola, for example)

ok, can you really quickly give me an example just so i can understand a little better

|dw:1435798222113:dw|

how would that be written as a function?

Say, that is a parabola
\(y=x^2\)

But that can be many functions... in fact infinite number of such functions.

I will give you a couple of classes of such functions.

i need to referesh the page, give me a sec

ok, thanks and take your time

oh, my bad a little error

|dw:1435799037236:dw|

are you lost?