How do you find the domain of $sqrt(2x+4)$ ?

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Answer 1 · 2016-08-30T12:09:32

The argument of a radical may not be negative.

$->2x+4>=0->2x>=-4->x>=-2$

There is no restriction in the upward direction, so the range is:
$-2<=x < oo$ or $[-2,oo)$ , the $[$ meaning 'inclusive'

How do you find the domain of sqrt(2x+4) sqrt(2x+4)?