Asked by INEEDHELP!!!
                a farmer wants to make a rectangular enclosure using a wall as one side and 120 m of fencing for the other three sides.
a) express the area in terms of x and state the domain of the area function
b)find the value of x that gives the greatest area.
my teacher didn't explain how to do this so im not sure, please help!
            
        a) express the area in terms of x and state the domain of the area function
b)find the value of x that gives the greatest area.
my teacher didn't explain how to do this so im not sure, please help!
Answers
                    Answered by
            bobpursley
            
    perimeter= 2s + l
120=2s + l
 
area= sl= s(120-2s)
Take the deriviative of area with respect to s, set to zero, and find s,l.
    
120=2s + l
area= sl= s(120-2s)
Take the deriviative of area with respect to s, set to zero, and find s,l.
                    Answered by
            bobpursley
            
     Oooppps. If you are in precal, you may not know derivative yet. In that case, graph A vs s, look for the max A, read where s is, then solve for l knowing s.
    
                    Answered by
            Anonymous
            
    265wxjb
    
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