A rectangular garden of area 532 square feet is to be surrounded on three sides by a brick wall costing
$ 14 per foot and on one side by a fence costing $5 per foot. Find the dimensions of the garden such that the cost of the materials is minimized.
Eliminate L from the following objective equation using the above constraint equation.
- C = 14 ( W+2L ) + 5W
- C(W) = 19( W + 784/W )
This is a step in solving my problem in my textbook. However I am confused as to how 784 came into the equation. What was multiplied to get it?