Question 200614: Farmer has 800 yards of fencing to enclose rectangular garden. Express the area A of the rectangle as a function of the width X of the rectangle. What is the domain of A?
Answer by RAY100(1637)   (Show Source):
You can put this solution on YOUR website! Perimeter = 2L +2w = 800 yds
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L=(800-2w) /2 = 400-w
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Area = L*W = (400-w) * w= 400w-w^2
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The graph of width vs Area starts at 0, rises to a max, and then drops again to 0
( this happens when x=0, and when L=0) ( L=0=400-w ,,,,,,,,,w=400)
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0 less than x less than 400,,,,,,,,,,,,, is DOMAIN of Area
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