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,

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TopNewestWhat is your question? – Pi Han Goh · 1 year, 8 months ago

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– 이채 린 · 1 year, 8 months ago

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

So the resultant value is non-negative, and not always positive, take \(x=0\) as an example. – Pi Han Goh · 1 year, 8 months ago

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