# 2019 AQA Old Spec Alevel Maths C3 Unofficial Mark SchemeWatch

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#1
Hi, I’ve literally just came out the exam

Anyone want to post there answers here?
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#2
Q1 it was like something -1.8 and another +be number so α is between 1.4 and 1.6

Q2 or Q 3 I can’t remember but for solving fg(x) I got -7 and 7 but reject -7 since x>2.25

For the last integration Q8 I got 1/2tan(arcsin2x)+c
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5 days ago
#3
I got pi( -1/e + 4) for solid of revolutions
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5 days ago
#4
Was the transformations lnx to ln(3x add 4 or minus 4???
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5 days ago
#5
Translation -4/3
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5 days ago
#6
The only single one question I got right (I completely missed half of the paper)
(Original post by Raeeskhan01)
Translation -4/3
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5 days ago
#7
boi i thought it was stretch(or shrink) idk by 1/3 then translate by [-4,0]

(Original post by Raeeskhan01)
Translation -4/3
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5 days ago
#8
lowering the grade boundaries for y'all
The only single one question I got right (I completely missed half of the paper)
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5 days ago
#9
i got something like pi(2-e^-1) , i worked it out quickly and it seemed too simple which makes me think im wrong
(Original post by Examer)
I got pi( -1/e + 4) for solid of revolutions
Last edited by ImadAli; 5 days ago
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#10
For the volume of revolution question. When u enter πX integration of (e^0.5x+3x)^2 into the graphical calculator u get 18.21186542, that’s the non exact form of the answer, and the exact form answer is π(28-36e^-0.5-e^-1) which is also 18.21186542
4
#11
For the geometric transformation is lnx into ln3x+4, so it’s stretch parallel to x scale factor 1/3 and then a translation vector (-4/3,0)
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5 days ago
#12
Yeah, I got that
(Original post by Enter_Haruka)
For the volume of revolution question. When u enter πX integration of (e^0.5x+3x)^2 into the graphical calculator u get 18.21186542, that’s the non exact form of the answer, and the exact form answer is π(28-36e^-0.5-e^-1) which is also 18.21186542
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5 days ago
#13
Did anyone get a negative answer for the mid-ordinate rule question??
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5 days ago
#14
Yep -2. something.
(Original post by IbrahimRafai)
Did anyone get a negative answer for the mid-ordinate rule question??
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#15
I got -2.26 I think
(Original post by Xena150)
Yep -2. something.
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5 days ago
#16
I need a full unofficial mark scheme to reassure myself 😂 because I got some weirdddd answers to some questions
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#17
I don’t remember the questions 😂 i would want to make one but I don’t even know if I done them right but I got 30 mins to spare when I finished the paper and checked over all of them, so I’m pretty sure they all correct but, this paper just goes too quickly I have a bad feeling about the grade boundaries
(Original post by IbrahimRafai)
I need a full unofficial mark scheme to reassure myself 😂 because I got some weirdddd answers to some questions
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5 days ago
#18
I’ll try thinking of some of my answers, maybe they’ll ring a bell:
1. x2=0.5 something and x3=0.47 something. Cobweb diagram
2. x=7 for f^-1(x) = 29
x=-7 not a solution as range of f(x) was f(x) >/= 0, therefore domain of f^-1(x) is x>/= 0
3. x = 2 3/10(ln10) for where the normal crosses the x axis
4. Integration value = 1/4(ln9)
-2.6 something for the mid ordinate rule (don’t know if you had to make it positive as it’s an area but oh well)
5. Stationary points:
(1,1) = minimum
(4,1/4) = maximum
6. Got 4 answers for the trig question: 25.9, 74.1, 106.8, 173.2
7. Volumes of revolution = pi(28 - 36e^-0.5 - e^-1)
8. I was baffed on part c) but the other two parts were okay proof questions.
(Original post by Enter_Haruka)
I don’t remember the questions 😂 i would want to make one but I don’t even know if I done them right but I got 30 mins to spare when I finished the paper and checked over all of them, so I’m pretty sure they all correct but, this paper just goes too quickly I have a bad feeling about the grade boundaries
Last edited by IbrahimRafai; 5 days ago
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#19
For the Q8 part c) I got 1/2tan(inverse sin2x) +c
I think when u use the substitution and u just work with the integral and u cancel out some of the bits, and then u ended up with just integrating 1/2sec^2u, which is 1/2tanu +c, and then rearrange the u to get x which is something like x=1/2sinu to get u=arcsin2x, and just substitute it in. I think I’ve done it correctly
(Original post by IbrahimRafai)
I’ll try thinking of some of my answers, maybe they’ll ring a bell:
1. x2=0.5 something and x3=0.47 something. Cobweb diagram
2. x=7 for fg(x) = 29
3. x = 2 + 3/10 (ln10) for where the normal crosses the x axis
4. -2.6 something for the mid ordinate rule (don’t know if you had to make it positive as it’s an area but oh well)
5. Stationary points:
(1,1) = minimum
(4,1/4) = maximum
6. Got 4 answers for the trig question: 25.9, 74.1, 106.8, 173.2
7. Volumes of revolution = pi(28 - 36e^-0.5 - e^-1)
8. I was baffed on part c) but the other two parts were okay proof questions.
0
#20
And also ur majority of the answer look exactly same as mine so we might have done alright on that paper 😂
(Original post by IbrahimRafai)
I’ll try thinking of some of my answers, maybe they’ll ring a bell:
1. x2=0.5 something and x3=0.47 something. Cobweb diagram
2. x=7 for fg(x) = 29
3. x = 2 + 3/10 (ln10) for where the normal crosses the x axis
4. -2.6 something for the mid ordinate rule (don’t know if you had to make it positive as it’s an area but oh well)
5. Stationary points:
(1,1) = minimum
(4,1/4) = maximum
6. Got 4 answers for the trig question: 25.9, 74.1, 106.8, 173.2
7. Volumes of revolution = pi(28 - 36e^-0.5 - e^-1)
8. I was baffed on part c) but the other two parts were okay proof questions.
0
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