Question

http://s24.postimg.org/hlrxsb69x/image.jpg Can someone tell, what am i doing wrong in this simplifying?

Answer 1

Answer has to be : 1 / b-a

Answer 2

you are right

Answer 3

Going from the first to the second step (across the =, if that makes sense?) , you mutiplied b and (b-a) and then multipled this by itself again, accidentally. If you want I can check your corrected work, since now it should end up as 1/(b-a).

Answer 4

Oh my mistake.. I understand. Thank u.