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,Originally Posted by china_88
$\displaystyle x^2-y^2=(x+y)(x-y)$
Thus,
$\displaystyle (a+b)^2-(c+d)^2$
Over here $\displaystyle x=a+b,y=c+d$. Thus,
(watch those signs
$\displaystyle [a+b+(c+d)][(a+b)-(c+d)]$
Thus,
$\displaystyle (a+b+c+d)(a+b-c-d)$.
Q.E.D.