The equation x2−y2=35x^2 - y^2 = 35x2−y2=35 factors as (x−y)(x+y)=35(x - y)(x + y) = 35(x−y)(x+y)=35. Which pair (x,y)(x, y)(x,y) is a positive integer solution?
(6,1)(6, 1)(6,1)
(12,11)(12, 11)(12,11)
(18,17)(18, 17)(18,17)
Both (A) and (C)