# Carrotsticks' Mathematics Extension 1 HSC 2017 solutions (1 Viewer)

#### Carrotsticks

Last edited:

##### Member
Yo carrot can you have a look at your DM's on bos when you get a chance pls

#### Carrotsticks

##### Retired
Okay uploaded them! Let me know if you see typos =)

#### Carrotsticks

##### Retired
For Q12(d), could we have have differentiated to get dt/dx and then different again and the. Flip the result to get the acceleration? If not how many marks would you think I would get for that solution and why doesn't it work
$\bg_white \\ Because \frac{1}{\left ( \frac{d^2t}{dx^2} \right )} \neq \frac{dx^2}{dt^2} unlike the first derivative where \frac{1}{\frac{dt}{dx}} = \frac{dx}{dt} Most likely your answer would score 1 out of 3. One mark for the correct first derivative.$

#### InteGrand

##### Well-Known Member
For Q12(d), could we have have differentiated to get dt/dx and then different again and the. Flip the result to get the acceleration? If not how many marks would you think I would get for that solution and why doesn't it work
$\bg_white \noindent In general, \frac{d^{2}x}{dt^{2}} \neq \frac{1}{\frac{d^{2}t}{dx^{2}}}.$

#### bobcheng1111

##### New Member
Can you post the paper here please ;(

Moderator

Thanks!