Answer:
-9
Step-by-step explanation:
The awnswer to the first equation is -4 and -4-5 is equal to -9
 
        
                    
             
        
        
        
Answer: I have no clue but I’ll look into it
Step-by-step explanation:
 
        
             
        
        
        
Answer:
b = 40 and -40
Step-by-step explanation:
General form of Perfect square trinomial is a 2 + 2 a b + b 2
 Therefore from 16 x 2 − b x + 25 a 2 = √ 16 x 2 , b 2 = 25 , then a = ± 4 x , b = ± 5 take consideration a=4x and b=-5 (different sign), then − b x = 2 ( 4 x ) ( − 5 ) − b x = − 40 x b = 40 
The perfect square is ( 4 x − 5 ) 2 = 16 x 2 − 40 x + 25 . 
if we consider a=4x and b=5 (same sign), then − b x = 2 ( 4 x ) ( 5 ) − b x = 40 x b = − 40
 The perfect square is ( 4 x + 5 ) 2 = 16 x 2 + 40 x + 25 . 
The first solution ( 4 x − 5 ) 2 is the best solution after comparing the expression given.  I hope this helps, xx .
 
        
             
        
        
        
Answer:
1
Step-by-step explanation:
1