eleven to the second power means eleven times eleven.
the answer is
121.
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112 = 11 x 11 = 121
5 to the second power times 11
If x^2 = 121 then the value of x is 11
2a to the second power. If you combine the like terms, (a to the second power + a to the second power), it would be the same as 2a to the second power.
x = +11 or -11