Question

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

Answer 1

See below.

Explanation:

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)`.