Question 843835
You can type sqrt(x^2 - 49) or surround your formula in triple curly braces or use TeX input, e.g. *[tex \large f(x) = \sqrt{x^2 - 49}]. The domain of f(x) is the set where the expression inside the sqrt is non-negative, i.e. (-infty, -7] U [7, infty).