​when you subtract one square number from another the answer is 35. what are the two square numbers?

18^2 - 17^2 = 35

Or you could have 6 and 1

6^2 - 1^2 → 36 - 1 → 35

There are eight integer solutions to this :

(-18)^2 - (-17)^2 = 35

(18)^2 - (17)^2  = 35

(-18)^2 - (17)^2  = 35

(18)^2 - (-17)^2  = 35

We can get the same result by using ± 6  and ± 1   in the same fashion