Answer with explanation:
→→→Function 1
 f(x)= - x²+ 8 x -15
Differentiating once , to obtain Maximum or minimum of the function
 f'(x)= - 2 x + 8
Put,f'(x)=0
-2 x+ 8=0
2 x=8
Dividing both sides by , 2, we get
x=4
Double differentiating the function
f"(x)= -2, which is negative.
Showing that function attains maximum at ,x=4.
Now,f(4)=-4²+ 8× 4-15
            = -16 +32 -15
           = -31 +32
           =1
→→→Function 2: 
f(x) = −x² + 2 x − 3
Differentiating once , to obtain Maximum or minimum of the function
f'(x)= -2 x +2
Put,f'(x)=0
-2 x +2=0
2 x=2
Dividing both sides by , 2, we get
x=1
Double differentiating the function,gives
f"(x)= -2 ,which is negative.
Showing that function attains maximum at ,x=1.
f(1)= -1²+2 ×1 -3
    = -1 +2 -3
   = -4 +2
  = -2
⇒⇒⇒Function 1  has the larger maximum.
 
        
             
        
        
        
Answer:
-18
Step-by-step explanation:
you add 12 and six together and you get 18. Then you put a negative sign in front of it
 
        
                    
             
        
        
        
Answer:
it will always be equals to -1
Step-by-step explanation:
2 x - 1/2 = -1
17 x - 1/17 = -1
 
        
             
        
        
        
I earned 5 for x and 12 for y but I'm not sure about the «y»