Answer
$[-2,\ \infty)$
Work Step by Step
We need to find the domain of:
$\sqrt{3x+6}$
We know that we can't take the square root of a negative number, so:
$3x+6\geq 0$
$3x\geq -6$
$x\geq-2$
Therefore, the domain is:
$[-2,\ \infty)$
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