please find solutions for the following problems

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.) X 6. Consider the equation = = 1- 32, which has a unique root between * = 0 and 2 - 1. Apply Newton's method twice to approximate the solution if you use the initial approximation ro = 1. Round each approximation to five decimal places. (You need to find z, and 72) (3 pts)