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**1. Homework Statement**

find the dimensions of a rectangle with perimeter 100m whose area is as large as possible

**2. Homework Equations**

area = XY

100 = 2x + 2y

y= 100/4x

x(100/4x)

(400x - 400x)/16x^2

1/16x^2 = 0

**3. The Attempt at a Solution**

well........

am lost