How do you find the domain of $sqrt(2x+5)$ ?

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Answer 1 · 2017-05-11T20:28:00

See below.

The inside of a square root cannot be negative in real numbers, so
$2x-5\geq0$ , so $x\geq5/2$ .

When $x$ approaches $oo$ , the square root also approaches $oo$ , so the domain of $x$ is $[5/2,oo)$ .

How do you find the domain of sqrt(2x+5)sqrt(2x+5)?