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The vertex form of a quatdratic equation (otherwise called the graphing form) is y=a(x-h)2+k

For those of you who don't know what 'h', 'a', and 'k' are, they are parameters. The negative sign in front of the 'h' refers to the opposite of the x coordinate in the vertex. The 'k' refers to the y coordinate in the vertex. 'A' refers to the stretch or compression factor. So, for example, say you have a parabola with a stretch factor of 2 whose vertex coordinates are (-3,4).

The equation would be y=2(x+3)2+4

Of course, if a parabola has no stretch/compression factor, there would be no 'a' in the equation.

I hope this helped, and good luck!

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