Write the domain of the following real functions.
(i) \(f(x)\) \(=\) \(\frac{2x + 1}{x - 9}\).
Domain of the function \(f(x)\) \(=\)
(ii) \(p(x) = \frac{-5}{4x^2 + 1}\)
Domain of the function \(p(x)\) \(=\)
Answer variants:
\(\mathbb{R}\)
\([-2, \infty]\)
\([2, \infty]\)
\(\mathbb{R}\)