$\"\"$

\

The expression is $\"\"$ .

\

$\"\"$ (Product of two different signs is negative) $\"\"$

\

If $\"\"$ , where b,d $\"\"$ .

\

$\"\"$

\

$\"\"$ (Multiply numerator: $\"\"$ )

\

$\"\"$ (Multiply denominator: $\"\"$ ) $\"\"$

\

The product is $\"\"$ .