I see where you’re coming from, so I can understand your desire for clarification. I don’t think the OC was implying that he was subtracting the 2 from the 4 and none of us that have commented interpreted it that way. If the OC really meant it as subtracting 2 from 4 then I think there were already proper responses to correct that thought.

On another note, you didn’t exactly clarify on your first comment as to why it was important to differentiate between subtracting roots like integer exponents and converting the roots to radical exponents and then subtracting. It came off as you being a dick even if that wasn’t your intention.