Question

Find the domain of the function

Answer 1

\[f(x) = \sqrt{2x - 4} -5\]

Answer 2

\[2x-4\ge0 \rightarrow 2x \ge4 \rightarrow x \ge2\]
\[D=[2,+\infty)\]

Answer 3

that's because of : "under radical cant be negative" :)

Answer 4

gotta remember that, thanks :)