(a² + b² - 2ab)  + 2ac - 2bc = (a - b)² + 2c(a-b) = (a-b)(a-b +2c)
        
             
        
        
        
Answer: No
Step-by-step explanation: Complementary angles are those that add up to 90 degrees, 47 + 53 equals to 100. 
 
        
             
        
        
        
Answer:
B) one 90 degree angle
Step-by-step explanation:
 
        
                    
             
        
        
        
Step-by-step explanation:
Given expression;
    2x + y  = -5;
   The given equation must be written in a form where the slope is the negative inverse of the given one. 
A line perpendicular to another will have a negative inverse slope. 
    2x + y  = -5 
   Equation of a straight line is generally written as; 
        y  = mx + c 
y and x are the coordinates 
m is the slope 
c is y - intercept
           2x + y  = -5 
                  y  = -2x -5
  The slope of the perpendicular =  
 
So, 
the new line;
             y  =   x  -5
x  -5
Any line with slope of   will be perpendicular
 will be perpendicular