X's

Use the FOIL Method.

 

x*x=x²

x*(-2)=-2x

x*2=2x

2*(-2)=-4

 

x²-2x+2x-4

 

Now combine like terms

 

-2x+2x=0x. 

 

Since the middle of the trinomial is 0x, there's no need to write it in.

 

x²-4

 

The answer is x²-4