Answer:
The relation is a function!
Your Domain should be...
{-1, 1, 7, 9}
Your Range should be...
{-1, 8, 9}
WHY?
Your domain is always your x-coordinates, which are the first coordinates in a pair. 
Your range is always your y-coordinates, which are the second coordinates in a pair. 
When listing the points, it's important to remain a relation CANNOT be a function if the x's repeat, so luckily, they do not repeat. 
Also, when listing points for your range, remember, if they repeat, you should only count one of the numbers, as you can see from the answer, there was two nines, but instead I put one. 
 
        
             
        
        
        
True 
merry Christmas and a happy new year :)
        
                    
             
        
        
        
9514 1404 393
Answer:
   3
Step-by-step explanation:
For f(x) = x^3 -2x^2 -7x +5 and x=1/(2-√3), we have ...
   f(x) = ((x -2)x -7)x +5
and ...
   x = 1/(2-√3) = (2+√3)/(2^2 -3) = 2+√3
Then ...
   f(2+√3) = ((2 +√3 -2)(2 +√3) -7)(2 +√3) +5
   = (3+2√3 -7)(2+√3) +5
   = 2(√3 -2)(√3 +2) +5 = 2(3 -4) +5 = -2 +5
   f(1/(2 -√3)) = 3
_____
If you really mean x = (1/2) -√3, then f(x) = (42√3 -3)/8.
 
        
             
        
        
        
Answer:
f(-3)=40
Step-by-step explanation:
 
        
             
        
        
        
paso a paso
Step-by-step explanation:
tienes que saber cuanto le quito al otro por que 
el primero es 168 y el otro es 138 cubro le quito 30 y el otro 
es 123 igual tienes que quitarle tal ves es sumarle primero y después 2 de restarle 
espero que te sirva