$\"\"$

\

Original function is $\"\"$ .

\

Replace x = 3 in original function.

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

Replace x = – 4 in original function.

\

$\"\"$

\

$\"\"$ \ \

\

$\"\"$

\

Product of two different sings is negative.

\

$\"\"$

\

\

$\"\"$ $\"\"$

\

\

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