Question

I am completely lost.

Step 1

Let x represents the width and y represents the length of field. Since no fencing is required along one side of rectangular field . Therefore we have expression for y as function of x as shown on board.

Step 2

The expression for area as funtion of x is shown on board.

Step 3

Now, we find the derivative of A with respect to x and the derivative+0 to get the value of x.Since at this value of x, double derivative of A ...

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