The length and breadth of a rectangle are (x + 3y) units and (9x - y) units respectively. The perimeter of this rectangle is equal to the perimeter of a square. Find the difference between area of square and area of rectangle.
1
25 x2 + 16xy + 15 y2
2
16 x2 - 16xy + 4 y2
3
21 x2 + 17xy - 4 y2
4
6 x2 - 7xy + 4 y2