When you've got a squares bracket, this simply becomes the bracket twice, therefore, (r+s)2 becomes (r+s)(r+s)
You've then go to use FOIL, and this gives you r^2+rs+sr+s^2, and this cannot be simplified any further.
Therefore, the product of this is r^2 + s^2 + rs + sr
Hope this is what you're looking for :)
        
             
        
        
        
I believe that x=4 would be the answer
        
                    
             
        
        
        
Answer:
   second difference
Step-by-step explanation:
The differences of the y-values will differ by a common amount.
<u>Example</u>:
   y = x^2 for x = 2, 4, 6, 8
   y-values are 4, 16, 36, 64
   differences of these are 12, 20, 28
   differences of these differences are 8 and 8, a common value.
 
        
                    
             
        
        
        
Angle 15 and Angle 9 make a straight line
        
                    
             
        
        
        
Step-by-step explanation:
the area of a square is the length multiplied the breadth 
 in a square, all sides are equal so:
A=n×n
A=n²