Answer:
x = 11
Step-by-step explanation:
x² = 121
You are solving for the variable, x. Note the equal sign, what you do to one side, you do to the other. Isolate the variable, x. Root both sides:
√(x²) = √(121)
x = √121 = √(11 * 11)
x = 11
x = 11 is your answer.
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