Am I wrong or is the BOS wrong? (HSC 2011 question) (1 Viewer)

[trapizi]

In HSC 2011 Question 7b which is an integration question, my answer is 1/8 ln(9) but in their sample answer they got -1/2 ln(3)...wth?

Sample answer (p.27)http://www.boardofstudies.nsw.edu.a...ematics-extension-2-hsc-sample-answers-11.pdf
Can someone please justify this

 

[dan964]

they calculate 2I

 

[Kurosaki]

In HSC 2011 Question 7b which is an integration question, my answer is 1/8 ln(9) but in their sample answer they got -1/2 ln(3)...wth?

Sample answer (p.27)http://www.boardofstudies.nsw.edu.a...ematics-extension-2-hsc-sample-answers-11.pdf
Can someone please justify this

haven't worked it out myself, but they say 2I, so they haven't divided by 2 to get the final answer yet + I think their denominator is wrong- it says (x-4) rather than (4-x).

 

[trapizi]

haven't worked it out myself, but they say 2I, so they haven't divided by 2 to get the final answer yet + I think their denominator is wrong- it says (x-4) rather than (4-x).

Oh yeah. So they're wrong . Thx!

 

[mreditor16]

* BOSTES



nah, but mistakes are common in hsc sample answers. hence, why they chuck the disclaimer at the front.

 

[Axio]

 

[BLIT2014]

In HSC 2011 Question 7b which is an integration question, my answer is 1/8 ln(9) but in their sample answer they got -1/2 ln(3)...wth?

Sample answer (p.27)http://www.boardofstudies.nsw.edu.a...ematics-extension-2-hsc-sample-answers-11.pdf
Can someone please justify this

Email BOSTES with correct working to the problem

 

[seventhroot]

Email BOSTES with correct working to the problem

in the end make sure to include:

gg no re

rekt

do u even HSC bro?

402 no scope

mountain dew

 

[mreditor16]

in the end make sure to include:

gg no re

rekt

do u even HSC bro?

402 no scope

mountain dew

inb4bannedagainforderailing

 

[seventhroot]

OP's question has been answered

/thread

 

[Drongoski]

(1/8) ln 9 or (1/4) ln3

 

[dan964]

BOS answers calculated for 2I not I and got the sign wrong.