Question

5-4=23

8-1=63

6-16=32

9-9=78

3-9=6

3-81=?

Answer 1

ans is 0
as in above pattern

$x {}^{2} - \sqrt{x}$
is being used

Answer 2

Answer is 0 because Cube of 3 is 9 root of 81 is 9 . So, 9-9= 0.