sq root of x^2

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
3 years, 1 month ago

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- 3 years, 1 month ago

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

- 3 years, 1 month ago

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.

- 3 years, 1 month ago

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