Question

What is the domain and range of `y = sqrt(x-4)`?

Answer 1

The domain is such that the argument `x-4>=0`

Explanation:

This means that `x>=4` or domain = `[4,oo)`

The range: `y` can only be non-negative, but has no limits at the upper side, so range = `[0,oo)`

Note: the "[" means 'inclusive'.