$\"\"$

\

Original function is $\"\"$ .

\

Replace x = 4 in original function.

\

$\"\"$

\

Evaluate powers: $\"\"$ .

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

Replace x = $\"\"$ 2 in original function.

\

$\"\"$

\

Evaluate power: $\"\"$ .

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$ and $\"\"$ .