Answer:
f(x)=(x-2)(x+2)(x-5)
Step-by-step explanation:
f(x)=x³-5x²+4x-20                 1. Just group randomly
f(x)=x²(x-5)+4(x-5)                2. Factor the groupings
f(x)=(x²+4)(x-5)                      
<u>f(x)=(x-2)(x+2)(x-5)</u>                3. Factor the difference of two squares
 
        
                    
             
        
        
        
Answer:
a
Step-by-step explanation:
 
        
             
        
        
        
part A:
company a
30m+15
m= matress
company b
28m+21
m=matresses sold
part B:
company a 
30(6)+15
195$
company b
28(6)+21
189$
company B charges less
part C:
company a
30(3)+15
105$
company b
28(3)+21
105$
there is no change at all so you do not save anything.
 
        
             
        
        
        
17
85/17 is 5 and 51/17 is 3