Thank you for your responses. I do realize that deriving equations in an English paper is a bad idea, so I'm not going to do it. I'll be explaining the reasoning behind relativity, etc. My teacher is rather dumb so, I think she won't even really try to understand the paper.
As I have discovered yesterday, there is a mistake on the page that I linked to yesterday. It had some characters missing, like delta infront of x' on line 10 and that should be equal to I not 1. So
here's the correct page (as much as I can tell).
Maybe it will help solve my problem by finding what I'm doing wrong. Here's what I do:
1) Set t' to 0 in equation #5 and solving for t:
t=(bx)/(ac)
2) Substitute t in the other equation 5:
x'=ax-(b^2*x)/(a)
3) Since
v=(bc)/a we can do this:
x'=ax-(b*v*x)/c
4)We can do the same thing again:
x'=ax-(v^2*a*x)/c^2
5)Factor out ax:
x'=a*(1-v^2/c^2)*x
So how do they get I to show up instead of 1??? Or is it a mistake in their text??
And why do they just get rid of x when they go to equation 7a. Wouldn't it become delta_x and then be replaced by I?
Thanks again.
BTW, I know this wasn't really necessary, but how do you like the pretty print for the equations? Click them if you haven't figured it out yet. could be useful for some more complex stuff.