1. ## Factoring

I'm just wondering how they factored this.

=(4+t^2)^2(24)-(24t)2(4+t^2)2t/(4+t^2)^4

=24(4+t^2)[(4+t^2)-4t^2]/(4+t^2)^4

i have no clue how they got from the first line to the second line.

2. Originally Posted by johntuan
I'm just wondering how they factored this.

=(4+t^2)^2(24)-(24t)2(4+t^2)2t/(4+t^2)^4

=24(4+t^2)[(4+t^2)-4t^2]/(4+t^2)^4

i have no clue how they got from the first line to the second line.
Is it possible for you to just present that in a nicer way?
If you have Office 2007, maybe you can create a Word doc? You don't seem to know LaTeX.

3. anybody?

4. Originally Posted by johntuan
anybody?
as janvdl indicated, we are not sure what you are talking about

do you mean: $\displaystyle \frac {24 \left( 4 + t^2 \right)^2 - 96t^2 \left( 4 + t^2 \right)}{\left( 4 + t^2 \right)^4}$ ?

5. Im just wondering how they got to number 1 to number 2.

6. Originally Posted by johntuan

Im just wondering how they got to number 1 to number 2.
they looked for what was common to the expression on the top and factored it out. 24 and (4 + t^2) was common to both terms on the top, so they pulled them out, and what is in the brackets is what is left after they factored out the common terms.