Since it is National Mathematics day let us see who can crack this.

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Since it is National Mathematics day, let us see who can crack this.
5 - 4 = 23
8 - 1 = 63.
6 -16 = 32
9 - 9 = 78
3 - 9 = 6
3 - 81 = ?
Explain the logic. Challenge for all masterminds!!

Click here for Answer

Answer is '0'
x²+sqrt(y)=Answer
hence,
3²+sqrt(81)=9-9=0