4X square - 4Y square - 4x + 4Y + 11 = 2

4X square - 4Y square - 4x + 4Y + 11 = 2

4X square - 4Y square - 4x + 4Y + 11 = 2
4x²-4x+1-(4y²-4y+1)=-9
(2x-1)²-(2y-1)²=-9