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並前往https://www.khanacademy.org/math/algebra2/x2ec2f6f830c9fb89:eq/x2ec2f6f830c9fb89:sqrt-eq/a/solving-square-root-equations-advanced

Solving square-root equations (article) | Khan Academy

For some reason, if you want to take the square root of both sides, and you get x= +/- 2, because -2 squared is still equal to four.

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