SOLUTION: why is the domain of square root of x^2 + x equal to x>=0 or x<= -1?

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Question 973070: why is the domain of square root of x^2 + x equal to x>=0 or x<= -1?
Answer by josgarithmetic(39618) About Me  (Show Source):
You can put this solution on YOUR website!
Why?
Why!

Try using some value for x outside of the stated domain, like let x=-1%2F2.

sqrt%28%28-1%2F2%29%5E2-1%2F2%29
sqrt%281%2F4-1%2F2%29
sqrt%28-1%2F4%29, not a "real" number, but is imaginary.


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