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

1. (Original post by HistoryStudent1)
How did you find the estimate? I got 4.49

Never mind, I figured it out, so annoyed I missed that.
2. (Original post by Salty carpet)
Anyone remember how many marks the triangle one was worth?
6 M
3. https://www.change.org/p/aqa-lower-g...iter=557227400

do the right thing.
4. (Original post by Manliker)
1.51?
For the second part, finding an estimate for just x^x ? Did no one else get this?
5. (Original post by bartbarrow)
ln(x^2) = 2lnx
(ln(x))^2 cannot be simplified

You had to rewrite (lnx)^2 as lnx*lnx
When using the integration by parts could u use the chain rule to differentiate
$(lnx)^2$
to
$\frac{2}{x}(lnx)$ or something like that
6. What was the estimation question after the simpsons? I keep getting 3.01 rather than 1.51

Wasn't it the integral of 5-x^x between 1.7 and 0.2??
7. (Original post by Parhomus)
6 M
I thought it was 4 but if you're sure then I'll take your word
8. (Original post by lollypandahype)
What was the estimation question after the simpsons? I keep getting 3.01 rather than 1.51

Wasn't it the integral of 5-x^x between 1.7 and 0.2??
The limits were the same as the simpsons question. Cant remember them tho
9. (Original post by fpmaniac)
The limits were the same as the simpsons question. Cant remember them tho
1.7 and 0.4 broseph
10. (Original post by Barbecuetime123)
1.7 and 0.4 broseph
Wasnt it 0.5? Because that gave height of 0.2
11. (Original post by Faz The Poet)
Wasnt it 0.5? Because that gave height of 0.2
Oh yeah, you're right
12. (Original post by fpmaniac)
When using the integration by parts could u use the chain rule to differentiate
$(lnx)^2$
to
$\frac{2}{x}(lnx)$ or something like that
Yes but the question was integrate ((lnx)^2)/(x^2)
13. (Original post by fpmaniac)
When using the integration by parts could u use the chain rule to differentiate
$(lnx)^2$
to
$\frac{2}{x}(lnx)$ or something like that
Yes, that is how it was done in one past paper before
14. got a little rant to post about that mother****ing core 3 exam
it was completely different to anything we've ever seen before????????!!!!!!!!! what the **** like there were 9 question mother****ing 9 ?????????? could anyone even answer question 9 like was it even possible?????? i have never seen anything like that before or been taught how to do it and then you need that in order to answer the next 2 questions and it was worth 8 marks!!!!!!!!!! how the **** i am supposed to ****ing show that i do in fact know how to complete part c if i can't work out part a because it has never been a question before??????also why would u include a mother ****ing area of a triangle that is irrelevant afcould u pls also explain what ln(3x) squared is i mean the following 7 marks relied on me knowing that????????? (I didn't!!!!!!!!!!!!!!!!)STOP GIVING US HENCE QUESTIONS WHEN WE CANT WORK OUT THE BIT BEFORE THE ****ING HENCEX^x ????????????????????????//the face that i was RELIEVED about seeing an integration by subsitution question after praying all week that it WOULDN'T come up really says a lota ****ing range question worth 5 MARKS???????Look at the mother****ING PAST PAPERS IN COMPARISON TO THAT QUESTION AND TO ALL THE QUESTIONS???i've been getting As and Bs in all my mocks, i've even got full marks a few times but i managed to miss about about 30 marks worth of questions and then was unable to complete any of the others also giving us a simpsons rule question with SIX strips to do in 4 minutes is quite a lot don't u think???AND SINCE WHEN DID A CORE 3 PAPER HAVE 9 QUESTIONS????????thank u so much aqa looking forward to seeing the grade boundaries as low as ur popularity right now although no matter how low they are i'm still ****ed lol xxxxxxxxxx
15. couldnt you rearrage (lnx)^2 to 2lnx and then take the 2 out of the integral???

(Original post by bartbarrow)
Yes but the question was integrate ((lnx)^2)/(x^2)
16. (Original post by bartbarrow)
Yes but the question was integrate ((lnx)^2)/(x^2)
(Original post by Dapperblook22)
Yes, that is how it was done in one past paper before
When inputting the limits did you get (ln1) in your answer somewhere since it was ln(3x) and one of the limits was 1/3 and which lead to the final answer
pi(-2(lnx)^2)
17. so it can give 2pi and then inside the integral lnx/x^2
18. (Original post by Faz The Poet)
Wasnt it 0.5? Because that gave height of 0.2
Ah thank you! I think I might have accidentally put it as 0.2 instead of 0.5 for the final estimation part, ugh. Hopefully I'll still get the method mark(s) for that question even with using the incorrect lower limit.
19. Firstly, I took a bit of a punt and I'm presuming it's wrong by saying that ln(3x)^2 = ln(3x) + ln(3x), and secondly, I have no idea how to prepare for core 4 now because obviously working through past papers until I'm at A* level hasn't worked...
20. Regarding the volumes of revolution question, is it ok to have u as (ln(3x))^2 and v' = x^-2 ?

and then u' = (2/x)*(ln3x) and v = -1/x

and go from there?

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