121 to the second power means 121 times 121.
1212 = 121 * 121 = 14,641
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121 is 11 to the second power 361 is 19 to the second power 576 is 24 to the second power 1000 does not belong because no number to the second power = 1000
(9n2 - 121) = (3n + 11) (3n - 11)
121 = (11)2
x2 + 121y2 = x2 - (-121)y2 = x2 - (11iy)2 = (x - 11iy)(x + 11iy)
The answer is 121 Since 11^2 = 11*11 = 121