# Math Help - Can anyone give a meaningful explaination to the below simplification

1. ## Can anyone give a meaningful explaination to the below simplification

= Ö2*(1+s^2)^-2[-2s^2+(1+s^2)]
= Ö2*(1+s^2)^-2 (1-s^2)

I really dont understand how [-2s^2 + (1+s^2)] simplifies to (1-s^2) can anyone explain it please?

2. Originally Posted by maxmadx
= Ö2*(1+s^2)^-2[-2s^2+(1+s^2)]
= Ö2*(1+s^2)^-2 (1-s^2)

I really dont understand how [-2s^2 + (1+s^2)] simplifies to (1-s^2) can anyone explain it please?
I think you are overthinking this:
$-2s^2 + (1 + s^2) = -2s^2 + 1 + s^2 = -2s^2 + s^2 + 1 = (-2 + 1)s^2 + 1 = -s^2 + 1 = 1 - s^2$

-Dan

3. oh yeah, now its obvious, thanks a lot!