First what you should do for this case is to rewrite the expression carefully to find the correct answer. You must respect the properties of the roots. Group the terms correctly. Answer option 2 See attached graph.
It would be 6(4a2 - 3) you would factor out just the 6 because the 18 doesn’t a a term with it like 34a2 does. then just divide normally to get ur answer 6(4a2 - 3)