What two numbers add up to 9 that is a square numbers?

Answer 1

The two square numbers that add up to 9 are 0 and 9. Specifically, (0^2 = 0) and (3^2 = 9), and their sum is (0 + 9 = 9). Another pair is (1^2 = 1) and (2^2 = 4), which also gives (1 + 4 = 5), but does not meet the requirement. Therefore, the only valid pair is 0 and 9.