Check the picture below.
now, since we know what "f" is, let us use the CNT triangle with the small COR one.

 
        
             
        
        
        
Answer: k=-1/x^2+2
           
Step-by-step explanation:
 
        
                    
             
        
        
        
2(-3-7)+5= <span>2(-10)+5= -20 + 5= -15
-15 is your final answer</span>
        
             
        
        
        
The answer is D. This is because all of the variables must be on one side so it can be factored.