Make the problem r=8-16. Then you will have r=-8, your answer
        
                    
             
        
        
        
-4g is what I got if ur evaluating 
If it’s something about slope I got -4
        
             
        
        
        
Answer:
yes
Step-by-step explanation:
 
        
                    
             
        
        
        
Red line shows
y=x^2-4 , cause it's going through point (0,-4)
So blue line shows 
y= -x^2+1 Point (1,0) belong to it , moreover x factor is negative , so the arms of parabola will go down
Have nice evenig :)
Greetings From Poland.
        
             
        
        
        
Please send a picture of the figure