# Thread: [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 ???

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

$x^2-y^2=(x+y)(x-y)$
$(a+b)^2-(c+d)^2$
Over here $x=a+b,y=c+d$. Thus,
$[a+b+(c+d)][(a+b)-(c+d)]$
$(a+b+c+d)(a+b-c-d)$.