+118670 If a question is ticked that does not mean you cannot continue it.
NOR does it mean that any mathematician has checked the answer.
Even if it has lots of hearts or it looks very impressive, it still could be incorrect!
So if you do not understand
or you think it is wrong
or you want more help
or you want a different type of solution
then
please say so!
You can say you think it is wrong, (give you reason for thinking this) but ALWAYS be polite and thank people for their time. 
