Q: When you subtract a square numbers with another square number you get 21 what are the two numbers?

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4 and 9

16 and 4

1 and 36

5 and 2

1 and 4?

-10

9 and 25

That isn't possible.

4 and 3

The square numbers are: 16-4 = 12

16 and 25

1 and 9.

They are: 16 amd 9

4 and 1.

324 - 289 = 35

The two square numbers are 9 (= 3²) and 4 (= 2²).

The numbers are 9 and 25. (If you allow zero as a square 02 = 0, then 0 and 16 are another pair.)

18 and 17.

42 - 32 = 7

25 - 9 = 16

4 and 9

9 and 4

4 and 2.

9 and 1

52 - 32 = 16.