Perform the indicated operation. Place the answer in the proper location on the grid. Write your answer in order of decreasing powers of x. Do not include parentheses in your answer. The area of a rectangle is (27x⁵ + 9x⁴ - 18x³) square feet. The width of the rectangle is 9x² feet. What is the length of the rectangle?
a) 3x³ + 1
b) 3x³ - 1
c) 3x³ + 2
d) 3x³ - 2