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# AQA A2 Mathematics MPC3 Core 3 - Wednesday 15th June 2016 [Official Thread] watch

1. (Original post by C0balt)
It was 4 because in my integral there was multiply by 2
You're right, silly mark dropped

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2. (Original post by jackherbert077)
See below

Or above
How does differentiating help find range? Ive never learned that :s
3. (Original post by 15150776)
How does differentiating help find range? Ive never learned that :s
Gives max point of the curve

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4. (Original post by 15150776)
How does differentiating help find range? Ive never learned that :s
It's like maximum points of a quadratic equation so you differentiate then put it equal to 0.
5. (Original post by 15150776)
How does differentiating help find range? Ive never learned that :s
Differentiating finds stationary point when you put it equal to zero. From that you can work out X value and therefore the Y value. You have seen the graph so you know f(x) is lower than that specific y value, as it's shown as a maxima.
6. (Original post by fpmaniac)
For the volume of revolution question did u get

$\Pi (-2(ln3)^2)$
Initially I got
$pi\int_{\frac{1}{3}}^{1} (-(ln3x)^2 - (something similar))$
But when i subbed in 1/3 I got ln1 which was 0 so got the above final answer
Sorry i didn't see this
Um I got pi[-(ln3)^2-2ln3+4]
7. (Original post by 15150776)
How does differentiating help find range? Ive never learned that :s
It was because they gave you the graph, and you could see that everything was below the stationary point. That's why you differentiated and set it equal to 0 to find the coordinates of the stationary point, and then you know that the graph is entirely below that point so the range is f(X) <= y value of stationary point.
8. (Original post by C0balt)
Sorry i didn't see this
Um I got pi[-(ln3)^2-2ln3+4]
I got that, then it all went downhill after then with the simplification...
9. (Original post by 15150776)
How does differentiating help find range? Ive never learned that :s
I didn't learn that either, it was about applying logic to solve the questions. The whole paper was about using logic instead of just asking the usual questions.
10. (Original post by BioStudentx)
Differentiating finds stationary point when you put it equal to zero. From that you can work out X value and therefore the Y value. You have seen the graph so you know f(x) is lower than that specific y value, as it's shown as a maxima.
Ohhh so was the diagram the full graph? I thought it was only the hraph to a restricted domain.

Sorry for sounding dumb but i dont get what you mean by You have seen the graph so you know f(x) is lower than that specific y value, as it's shown as a maxima
11. Nothing else to say lads apart from I'm genuinely heart-broken. After averaging 99% UMS last year, so far I've dropped around 23 marks (AT LEAST) most likely i'll get around 48. It is very very sad, but I feel for those who require A*s (for their Oxbridge offers) or those that didn't do too well at AS.

But just to end on positivity, 39/75 has been an A* in an AQA biology exam before. Just remember that before you give up.
12. (Original post by TheCallunxz)
I didn't learn that either, it was about applying logic to solve the questions. The whole paper was about using logic instead of just asking the usual questions.
I agree, I think they normally give you what you need to do more clearly.
13. (Original post by C0balt)
Sorry i didn't see this
Um I got pi[-(ln3)^2-2ln3+4]
Do you remember what u go for the indefinite integral?
14. (Original post by zshn)
It was because they gave you the graph, and you could see that everything was below the stationary point. That's why you differentiated and set it equal to 0 to find the coordinates of the stationary point, and then you know that the graph is entirely below that point so the range is f(X) <= y value of stationary point.
Ohhhhhh thanks i get it
15. Today AQA shoved their .... up my .....

FML.
16. (Original post by 15150776)
Ohhh so was the diagram the full graph? I thought it was only the hraph to a restricted domain.

Sorry for sounding dumb but i dont get what you mean by You have seen the graph so you know f(x) is lower than that specific y value, as it's shown as a maxima
The graph didn't show the whole function plotted, but since you can find the maximum point of the entire function, and there is only one, then every other value has to be below that. Which gives you the range

That was my figuring anyway.
17. Can someone explain how to integrate the x^x q? I ended up with 1.3....

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18. (Original post by TheCallunxz)
I didn't learn that either, it was about applying logic to solve the questions. The whole paper was about using logic instead of just asking the usual questions.
Yeah i just didnt spot it. The replies made me seem like there was an actual method where using differentiation yoy can find the range lol
19. (Original post by BioStudentx)
Nothing else to say lads apart from I'm genuinely heart-broken. After averaging 99% UMS last year, so far I've dropped around 23 marks (AT LEAST) most likely i'll get around 48. It is very very sad, but I feel for those who require A*s (for their Oxbridge offers) or those that didn't do too well at AS.

But just to end on positivity, 39/75 has been an A* in an AQA biology exam before. Just remember that before you give up.
39? F u c king hell

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20. (Original post by toml95)
Today AQA shoved their .... up my .....

FML.
Be glad you weren't sitting the M3 exam from last week then.

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