$\"\"$

\

The functions are $\"\"$ .

\

a) (f + g)(x)

\

$\"open$

\

$\"\"$ (Substitute $\"\"$ )

\

$\"\"$

\

$\"\"$ .

\

$\"\"$

\

b) (f $\"\"$ g)(x)

\

$\"open$

\

$\"\"$ (Substitute $\"\"$ )

\

$\"\"$

\

Product of same sings is positive.

\

$\"\"$

\

$\"\"$ .

\

$\"\"$

\

c) $\"open$

\

$\"\"$

\

$\"\"$ (Substitute $\"\"$ )

\

$\"\"$ (Using FOIL method)

\

Product of difference sings is negative.

\

$\"\"$

\

Product of same sings is positive.

\

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

\

d) $\"open$

\

$\"open$

\

$\"\"$ (Substitute $\"\"$ )

\

Take out common factor.

\

$\"\"$

\

$\"\"$ .

\

$\"\"$

\

The functions are $\"\"$ , $\"\"$ , $\"\"$ and $\"\"$ .