Determining whether values are in domain of function

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Determining whether values are in domain of function
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Wouldn't root of 6 is equal to the function g(x) be not in domain as it can have two possible answers a negative and positive if simplified?

redninjazz
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How would you know if it is in the domain or not

edithub
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Am confused here cos i think for the root of 3x are we not suppose to say 3x is not equal to zero before inserting -3 in the question.

alaooluwaseun