$\"\"$

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Observe the graph :

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From graph the vertex is $\"\"$ .

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Quadratic function in vertex form $\"\"$ .

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Substitute for $\"\"$ , $\"\"$ in $\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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Find the value of $\"\"$ .

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The parabola passes through point $\"\"$ .

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Substitute for $\"\"$ , $\"\"$ in $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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Substitute for $\"\"$ , $\"\"$ and $\"\"$ in $\"\"$

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$\"\"$

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$\"\"$

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The quadratic function is $\"\"$ . $\"\"$

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The quadratic function is $\"\"$ .