$\"\"$

\

The sequence is $\"\"$ .

\

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

\

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

\

$\"\"$

\

$\"\"$ .

\

$\"\"$

\

$\"\"$ .

\

$\"\"$

\

$\"\"$ .

\

$\"\"$

\

Solve the system of linear equations.

\

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

\

$\"\"$

\

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

\

$\"\"$

\

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

\

$\"\"$

\

$\"\"$ .

\

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

\

$\"\"$

\

$\"\"$

\

$\"\"$ .

\

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

\

$\"\"$

\

$\"\"$

\

$\"\"$ .

\

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

\

$\"\"$ .

\

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

\

$\"\"$

\

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