Answer:
It would be -2. 
Step-by-step explanation:
<u>Key skills: Conjugate, Distribution Property, and Addition/Subtraction </u>
3 +  is your expression. The conjugate is an important concept you need to know to solve this.
 is your expression. The conjugate is an important concept you need to know to solve this. 
Given the expression:  
 
It's conjugate would be:  
 
(Basically if there is an addition sign between the 2 terms, it would become a subtractions symbol and if there is a subtraction symbol it would become an addition symbol)
1) So the conjugate of   would be
 would be 
2) Now we would have to multiply them 
- ( )( )( ) is your expression. ) is your expression.
- If you use distribution property, you will get to:   
- The two middle terms would cancel out (they both add up to 0), so then we have   
- This would simplify into 9-11, which is then <u><em>-2</em></u>
Hope you understood, and have a nice day!! :)