# An exemple i dont understand

• Jan 31st 2013, 03:03 AM
Petrus
An exemple i dont understand
Attachment 26782Hello 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..
• Jan 31st 2013, 04:49 AM
emakarov
Re: An exemple i dont understand
Which step precisely don't you understand?
• Jan 31st 2013, 04:58 AM
earboth
Re: An exemple i dont understand
Quote:

Originally Posted by Petrus
Attachment 26782Hello 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

$\displaystyle (a+b)^2=a^2+2ab+b^2 = \underbrace{a^2+b^2}_{h^2}+4\cdot \left(\underbrace{\frac12 ab}_{= 25}\right)$
• Jan 31st 2013, 05:25 AM
Petrus
Re: An exemple i dont understand
Quote:

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:)