Question 973070
Why?
Why!


Try using some value for x outside of the stated domain, like let {{{x=-1/2}}}.


{{{sqrt((-1/2)^2-1/2)}}}
{{{sqrt(1/4-1/2)}}}
{{{sqrt(-1/4)}}}, not a "real" number, but is imaginary.



Do you want to allow for imaginary numbers or only real numbers?