Answer:
All real square roots of 121 is +11 and -11.
When you square root something, you take the positive and negative of the number, so the square root of 121 would be 11 and -11.
When you do 11 times 11, you get 121 and when you do -11 times -11, you get 121 as well, this is why we do the negative as well.
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