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The domain of an expression

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For the rational expression (x^2-1) / (x+1)^2, the domain of this is expression is?

all values of x
all values of x satisfying x does not equal 1
all values of x satisfying x does not equal -1
all values of x satisfying x does not equal 0
none of the above.

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The domain of an expression is exhibited.

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The domain of an expression is the set of all values of x that can be substituted into the expression. For a rational expression, the denominator of the expression can not be zero, ...

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