It means [ 4 x 4 x 4 x 4 ], and that's 256.
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4x4x4x4
81 raised to the 4th power is calculated as ( 81^4 ). Since ( 81 = 3^4 ), we can rewrite it as ( (3^4)^4 = 3^{16} ). Calculating ( 3^{16} ) gives us 43,046,721. Thus, ( 81^4 = 43,046,721 ).
It means 4 times 4 = 16
-2 to the 4th power is 16.
2401