Question

Which of the following are rational functions?

• A. $\sqrt{x}$
• B. ${(5-4x)}^{1/4}$
• C. $\frac{x-1}{x+1}$
• D. $\frac{x^2-1}{x^2+1}$
• E. $x+4$
• F. $\sqrt{x^2+4x}$
• G. $(x^2-1)(x+1)$
• H. $x^3-4x+7$

Answer 1

Answer: (C), (D), (E), (G), (H)

$x^3-4x+7$