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What real values of $x$ are not in the domain of $f(x)=\frac{1}{|x^2+3x-4|+|x^2+9x+20|}$?

 Mar 28, 2020
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The absolute values are defined for all values of x, so the domain of f(x) is all real numbers.  In interval notation, this is (-inf,inf).

 Mar 29, 2020

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