Question 1064348
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An expression is well-defined if you can compute its value without any illegal operations. Examples of expressions 
that are not well-defined include 1/0 and sqrt{-10}. For what values of x is the expression

[sqrt{x + 1} + sqrt{1 - x}] /sqrt{x}
well-defined?

Express your answer in interval notation.
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For your expression to be well defined, the following conditions must be satisfied:


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x + 1 >= 0,

1 - x >= 0,

x >= 0      and

x =/= 0.


The solution is  0 < x <= 1.


In the interval form, x must belong to the set ({{{0}}},{{{1}}}].
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