Use Lagrange multipliers to prove that the rectangle with maximum area that has a given perimeter p is a square. Let the sides of the rectangle be x and y and let f and g represent the area (A) and perimeter (p), respectively. Find the following. A = f (x, y) = p = g (x, y) = f (x, y) = lambda g = Then lambda = 1/2y = implies that x = Therefore, the rectangle with maximum area is a square with side length.
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Home » Mathematics » Use Lagrange multipliers to prove that the rectangle with maximum area that has a given perimeter p is a square. Let the sides of the rectangle be x and y and let f and g represent the area (A) and perimeter (p), respectively. Find the following.