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But in this case, it is not just the square root of a number. It is the square root of the square of a number. So the resultant value after the square has to be positive,

Note by 이채 린 2 years, 2 months ago

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oh it wasn't a question but I do want to know if it is valid or not.

Almost correct. Keep in mind you're dealing with real numbers only, so \( \sqrt {x^2} = |x| \) is true. Where \(|x| \) is the absolute value of \(x\).

So the resultant value is non-negative, and not always positive, take \(x=0\) as an example.

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oh it wasn't a question but I do want to know if it is valid or not.

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Almost correct. Keep in mind you're dealing with real numbers only, so \( \sqrt {x^2} = |x| \) is true. Where \(|x| \) is the absolute value of \(x\).

So the resultant value is non-negative, and not always positive, take \(x=0\) as an example.

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