All you need is the double angle identity:

So we have

Apply the identity again to the squared term:

 
        
             
        
        
        
The answer is = (x + 5y) (x + 7y)
Break the expression into two groups.
 
x^2 + 12xy + 35y^2
(x^2 + 5xy) (7xy + 35^2)
Factor out x from x^2 + 5xy: x(x + 5y)
Factor out 7y from 7xy + 35y^2: 7y(x + 5y)
=x(x + 5y) + 7y(x + 5y)
Next, factor out the common term (x+ 5y).
Answer = (x + 5y) (x + 7y)
        
                    
             
        
        
        
Answer:
The area of this shape is 16 square feet.
Step-by-step explanation:
 
        
             
        
        
        

we know that 7*7=49 so thus 


therefor n=2
it is written as 
 
 
        
             
        
        
        
Answer:
B:  
 
Step-by-step explanation:
1. Substitute  for c:
 for c:  
 
2. Solve substitution: 
3. Compare  to calculated answers when
 to calculated answers when 
4.  when
 when  is
 is 