Question

Let s be the set of all ordered pair (x y) of positive integers satisfying the condition x^2-y^2=12345678

Answer 1

x^2-y^2...........(1)

putting x=1, y=0 we in  (1)  we get x^2-y^2=1

putting x=2 ,y=1 we in  (1)  we get x^2-y^2=3

putting x=3, y=2 we in  (1)  we get x^2-y^2=5

putting x= 4,y=3 we in  (1)  we get x^2-y^2=7

we get points(1,0),(2,1),(3,2),(4,3)

these points satisfy the condition