2007 cssa solutions? (1 Viewer)

[Tmer]

does anyone have the 2007 cssa solutions?
2 simple questions are driving me crazy!!

q3dii and q6c i+ii
http://www.angelfire.com/ab7/fourunit/cssa2007.pdf
if any 1 can do these please, please show me..

edit: nvm q3 hikari solved..

 

[Hikari Clover]

回复: 2007 cssa solutions?

q3 was already solved for u .....

i need Q6.....

by the way , any1 needs solutions for Q8 ?

 

[Tmer]

ok i think i at least worked out the 2nd part of q6

using the quadratic root formula x^2=..... and solving for discriminant >=0
two solutions are established either b>=2 or b<=-2 but using the quadratic formula again x=.... b>=2 doesnt make sense
so b<=-2

i am not too confident with this answer tho...

 

[Hikari Clover]

回复: Re: 2007 cssa solutions?

how did u do Q1 (c),the last bit..........

 

[Tmer]

remember limit of sinx/x from 3 unit? as x--->0 sinx/x approaches 1 (drawing a graph will show u this)
and limit of sinx/x as x----> infinity is obviously 0...
so 1=a and 0=a+b b=-1

ps. server veryy laggy atm tried to post this an hr ago..