Question 819912
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Hi,
Rectangle: width x  and length(2x-5), area = 150ft^2, find Perimeter
<img src='http://img585.imageshack.us/img585/479/rectangle.png' border='0'/></a>
A = x(2x-5) = 150f^2
   2x^2 -5x - 150 = 0
   (2x +15)(x -10) = 0   x = 10ft  (tossing out negative solution for unit measure
Rectangle: width of 10ft, length of 15ft
 P = {{{2*10ft + 2*15ft = highlight(50ft)}}}  50ft of fencing will be needed