GRE Question of the Day (June 11th)

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Which of the following functions has as its domain the set of all real numbers?


Indicate all that apply.

A. \({f(x)=\frac{{4}}{{x+4}}}\)

B. \({ f(x)=\frac{{4}}{{x^2+1}}}\)

C. \({f(x)=[square_root]4x^3[/square_root]}\)

D. \({f(x)=[square_root](-4x)^2[/square_root]}\)

E. \({f(x)=\sqrt[3]{4x}}\)

Question Discussion & Explanation