Check my work: −4 sqrt of x - 3 = 12?

Question

anonymous · Answer

x = 0, solution is not extraneous - I think this is the answer since the problem has no solution so there isn't two possible answer (there's none)

x = 0, solution is extraneous

x = 12, solution is not extraneous

x = 12, solution is extraneous

Am I right?

anonymous · Answer

I have other questions like this where I'm getting one x value. Extraneous is when there's two values and one of them is a false result. I'm only getting one result for all the questions that match this so that's non-extraneous, right?

anonymous · Answer

Well, okay. Thanks, everyone, for the help -.-