$\"\"$

\

The expression is $\"\"$

\

$\"\"$ (Product of two same signs is positive)

\

if $\"\"$ ,where b,d $\"\"$

\

$\"\"$

\

$\"\"$ (Multiply numerators: $\"\"$ )

\

$\"\"$ (Multiply denominators: $\"\"$ )

\

$\"\"$ (18 can be written as $\"\"$ )

\

$\"\"$ (Cancel common terms) $\"\"$

\

The product is $\"\"$ .