stuck on this question need help (1 Viewer)

[luthrax]

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[luthrax]

soz, dont know how to upload pic up

 

[Forbidden.]

soz, dont know how to upload pic up

http://imageshack.us

 

[kathrynso]

Ok, if any one reads this, I would like someone to explain something for me.

From the 2001 HC paper, Question 7 c.

Displacement: X= (t-2)/(t+2)
ii. Show that x = 1 - 4/(t+2)

In the answers it says:
x = [(t+2)-4]/(t+2)
= (t+2)/(t+2) 4/(t+2)
= the question.

Now I don't quite understand where they whipped this new equation from and also the t + 2 's

 

[SoulSearcher]

Ok, if any one reads this, I would like someone to explain something for me.

From the 2001 HC paper, Question 7 c.

Displacement: X= (t-2)/(t+2)
ii. Show that x = 1 - 4/(t+2)

In the answers it says:
x = [(t+2)-4]/(t+2)
= (t+2)/(t+2) 4/(t+2)
= the question.

Now I don't quite understand where they whipped this new equation from and also the t + 2 's

(t+2) - 4 = t-2

So (t-2)/(t+2)
= [(t+2)-4]/(t+2)
= (t+2)/(t+2) - 4/(t+2) [By splitting the fraction]
= 1 - 4/(t+2)

 

[luthrax]

http://imageshack.us

thanx, here is the question if i did it right

 

[luthrax]

i can do iii) but not properly, and iv) i have no idea, any help would be good, please