SOLUTION: a rectangle has a perimeter of 400 feet... express its area in terms of one of its sides,x

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Question 509441: a rectangle has a perimeter of 400 feet... express its area in terms of one of its sides,x
Answer by richard1234(7193) About Me  (Show Source):
You can put this solution on YOUR website!
If x is the side length, then the other length is 200-x (not 400-x, see why?). The area would be x(200-x), or -x^2 + 200x.