$\"\"$

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From the graph the vertex of the parabola is at $\"\"$ ,

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The parabola of the vertex is $\"\"$ , $\"\"$ , and $\"\"$ .

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The point on the graph of the parabola $\"\"$ , $\"\"$ and $\"\"$ .

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(Apply vertex form of the parabola equation: $\"\"$ )

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Now we can find a value. $\"\"$

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(Substitute 3 for h, 0 for k, 6 for x and $\"\"$ for y)

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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(Divide each side by 9)

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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(Substitute $\"\"$ for a, 3 for h, and 0 for k)

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$\"\"$

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$\"\"$ $\"\"$

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The vertex form of the parabola equation is $\"\"$ .