$\"\"$

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The sequence is $\"\"$ .

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The $\"\"$ term can be represented by a quadratic equation of the form $\"\"$ .

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Substitute $\"\"$ and $\"\"$ values in $\"\"$ .

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$\"\"$

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$\"\"$ .

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$\"\"$

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$\"\"$ .

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$\"\"$

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$\"\"$ .

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$\"\"$

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Find the values of $\"\"$ and $\"\"$ .

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Subtract equation $\"\"$ from $\"\"$ .

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$\"\"$

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Subtract equation $\"\"$ from $\"\"$ .

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$\"\"$

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Subtract equation $\"\"$ from $\"\"$ .

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$\"\"$

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$\"\"$ .

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Substitute $\"\"$ in equation $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$ .

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

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$ .

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

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$\"\"$ .

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The quadratic model equation is $\"\"$ .

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$\"\"$

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The quadratic model equation is $\"\"$ .