a) d^4k+1 - 5d^2k+1 +4d. (hint: d^x+y = d^x * d^y)

b) find m such that x+1 will be a factor of x^85 + mx - 4

c) Petula has 100 ft of fencing to enclose a pen for her pet pig Bud. She will use the river as one side of the rectangular pen, because she knows that Bud cannot swim and is afraid of water. The barn will be another side of the pen. What pen dimensions will give Bud the most area?