Mathopolis: Transforming Function Qs

[caligari]

Mathopolis Question Database

I was wondering why this function was this answer and not X^2+2x+4 and why it is in the form that it is. Is it just some rule that you put it in that form? In the answer given, (x + 4)2 + 2(x + 4) , I don't understand how you get 3 different (x+4). Even though the answer is right there and it explains it I still don't get it. X^2+2x+4 makes sense to me.

 

[Evgeny.Makarov]

Which question number are you talking about?

In the answer given, (x + 4)2 + 2(x + 4) , I don't understand how you get 3 different (x+4).

Where do you see three different $(x+4)$ in $(x + 4)^2 + 2(x + 4)$?

Even though the answer is right there and it explains it

What exactly explains it?