SOLUTION: Hi, could you please check my answer for this question. If it is wrong, could you explain to me how you got the right answer. Thank you so much! Find the domain of f(x)= 7 + s

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Question 82678: Hi, could you please check my answer for this question. If it is wrong, could you explain to me how you got the right answer. Thank you so much!
Find the domain of f(x)= 7 + squared 3x + 21, and express it using interval notation.
The answer I received is [-7, 00
Answer by stanbon(57967) About Me  (Show Source):
You can put this solution on YOUR website!
Find the domain of f(x)= 7 + sqrt(3x + 21), and express it using interval notation.
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The radicand, 3x+21, cannot negative.
So, you have to determine when it is not negative:
3x+21>=0
3x>=-21
x>=-7
Answer in interval notation: [-7,inf)
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Cheers,
Stan H.