$\"\"$

The standard form of complex number is $\"\"$ and its complex conjugate is $\"\"$ .

The complex number is $\"\"$ and its conjugate $\"\"$ and their multiplication is $\"\"$ .

Apply formula : $\"\"$ .

$\"\"$ \ \

$\"\"$

Substitute the value $\"\"$ . \ \

$\"\"$ \ \

$\"\"$ .

$\"\"$

The solution is 164.