Question

Let the function f be defined by the equation y = f(x) where x and f(x) are real numbers. Find the domain of the function.
f(x) = √5x

Answer 1

if this is
\[f(x)=\sqrt{5x}\] then domain is \[x\geq0\]

Answer 2

The domain is \[x \ge 0\]. Because you can't have negatives under a square root sign.