# Thread: An exemple i dont understand

1. ## An exemple i dont understand

Hello i understand evrything without the last part where they get (a+b)^2... (Relate to the familiar) i try to understand but i dont get it, i would be glad if some1 could try explain for me.
edit: idk why My picture become like that... Well, sorry for bad pictures..

2. ## Re: An exemple i dont understand

Which step precisely don't you understand?

3. ## Re: An exemple i dont understand

Originally Posted by Petrus
Hello i understand evrything without the last part where they get (a+b)^2... (Relate to the familiar) i try to understand but i dont get it, i would be glad if some1 could try explain for me.
edit: idk why My picture become like that... Well, sorry for bad pictures..
Expand

$\displaystyle (a+b)^2=a^2+2ab+b^2 = \underbrace{a^2+b^2}_{h^2}+4\cdot \left(\underbrace{\frac12 ab}_{= 25}\right)$

4. ## Re: An exemple i dont understand

Originally Posted by emakarov
Which step precisely don't you understand?
Sorry for the less information i gave:P but i think i got it now! earboth explained and thats so logic Ty for taking ur time