Correct, you dont need to multiply through by the conjugate.
I think the question is simple but not sure if this would be correct. I have a limit that is:
x->2 sqrt (2x+6) -4
Now the bottom would be root 10 - 4, so I don't think I need to multiply it by root 10 +4 to get rid of it so is that fine?
x could not be 5