# Math Help - [SOLVED] How do I get to answer this problem ?

1. ## [SOLVED] How do I get to answer this problem ?

how do I solve this.... (a+b)squared - (c+d)squared ???

Please help me by giving me the solution.... THANKS !!!

2. Originally Posted by china_88
how do I solve this.... (a+b)squared - (c+d)squared ???

Please help me by giving me the solution.... THANKS !!!
Remember the diffrence of two squares,
$x^2-y^2=(x+y)(x-y)$
Thus,
$(a+b)^2-(c+d)^2$
Over here $x=a+b,y=c+d$. Thus,
(watch those signs
$[a+b+(c+d)][(a+b)-(c+d)]$
Thus,
$(a+b+c+d)(a+b-c-d)$.
Q.E.D.