5. A farmer with 400 meters of fencing wants to enclose a rectangular area and then divide it into three equal pens using a fence parallel to one side of the rectangle. Find the largest possible area of the three pens. Justify why your answer is an absolute maximum. (3 pts.) 1- X 6. Consider the equation x3 = 1 -3x, which has a unique root between z = 0 and x = 1. Apply Newton's method twice to approximate the solution if you use the initial approximation 20 = 1. Round each approximation to five decimal places. (You need to find x1 and x2) (3 pts)