5 - 4 = 23 8 - 1 = 63. 6 -16 = 32 9 - 9 = 78 3 - 9 = 6 3 - 81 = ?

5 - 4 = 23 8 - 1 = 63. 6 -16 = 32 9 - 9 = 78 3 - 9 = 6 3 - 81 = ?

For all the Math Pundits

Crack this one

5 - 4 = 23
8 - 1 = 63.
6 -16 = 32
9 - 9 = 78
3 - 9 = 6
3 - 81 = ?
Explain the logic.
Challenge for all masterminds!!

Answer: 3-81 = 0

Logic: a×a-b ka underroot

a*a- under root (b)

As 5×5-4ka underroot
25-2=23

8×8-1ka underroot
64-1=63
.
.
So 

3x3-81ka underroot

9-9=0


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