11 and -11.
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The square roots of 121 are -11 and 11.
11 * 11 = 121
121
The square root of 121 = 11 or -11. Since 11 is prime this cannot be written any simpler. * * * * * Those are the two square roots of 121. The question asked for only the negative root, which is -11.
√0.0256 = ± 0.16 The two square roots are 0.16 and -0.16.