That's a question for arrangement, so we have:
 
 
        
        
        
For this case we must complete squares:

We add the square of half the coefficient of the term "x",
 on both sides of the equation:
 on both sides of the equation:

According to the perfect square trinomial we have:

Rewriting the expression we have:

ANswer:

 
        
             
        
        
        
Answer:
C
Step-by-step explanation:
 
        
             
        
        
        
13, 6+7=13 thats my answer :D
        
             
        
        
        
3×3=9 miles. As a result, hiker traveled total 9 miles in that time. Hope it help!