Question

\bf Test test

Answer 1

Eh?
\(\bf test\) ? You mean like that? You need the `\(` and `\)` to start and end the \(\TeX\) code block or the MathJax interpreter will not trigger. So you need to type `\(\bf test\)` to get \(\bf test\).

Answer 2

I don't know what \bf test is ;-; Sorry.

Answer 3

\(\bf test test/)

Answer 4

\(test test\)

Answer 5

Well, closer. You just did not do the bold face \bf in front.