I think teaching answers are usually much better..... So long as the answerer actually knows what they are talking about.
If the asker have already attempted it they should show their own working, and they should ask if someone can find their mistake.
For some people whole answers are good but there are far too many people here who are interested only in the answer and working that they can copy. By giving them the whole answer they will only learn a method to cheat. They will learn no maths.
Even for good kids, they will usually learn more if they have to do some of the thinking for themselves.