$\"\"$

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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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Consider vertex is $\"\"$ ,i.e $\"\"$ and $\"\"$ .

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Substitute $\"\"$ and $\"\"$ in the above equation.

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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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Substitute $\"\"$ , $\"\"$ and $\"\"$ in the equation $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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The quadratic function is $\"\"$ .