Possible Duplicate:
Significance of $\displaystyle\sqrt[n]{a^n} $?
The square root of a number squared is equal to the absolute value of that number. Why is $\sqrt{x^2} = |x|$? Why not just $x$? Please give me a reason and also help me prove it.
Possible Duplicate:
Significance of $\displaystyle\sqrt[n]{a^n} $?
The square root of a number squared is equal to the absolute value of that number. Why is $\sqrt{x^2} = |x|$? Why not just $x$? Please give me a reason and also help me prove it.