The answer is x = {-1, 9}
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9/20 
explanation: 
7/10 - 1/4
14/20 - 5/20
14-5/20
9/20
        
                    
             
        
        
        
Answer:
?=9
Step-by-step explanation:
We have a special right triangle, the 45-45-90 triangle. 
In a 45-45-90 triangle, the side lengths are x, and the hypotenuse is x√2. 
Since we know that the side length is 9, this means that: 

The ? is 9. 
 
        
             
        
        
        
(x + 7)/2 - (x + 4)/2 = (x + 7 - (x + 4)/2 = (x + 7 - x - 4)/2 = 3/2
 
        
             
        
        
        
Since each side of a sqare is equal and there are four sides to the square 

X being the side length. 
Then you would simiply divide by 4 to isolate x 

A side length is 56