Edexcel AS Level Maths May 15th 2025 Pure Paper 1 + Unofficial Mark Scheme
Unofficial mark scheme:
Credit to: @Jeff1527383
1i) A(-3,0) B(0,7) Asymptote y=3
ii) A(-1,0) B(2,-7) Asymptote y=-3
2a) y=4x+12
b) {y : 2x^2+5x-3 <= y < 4x+12}
3a) 2sqrt(10)
b) 47.6 degrees
4a)Centre (-5, 2), radius sqrt(28)
b) {k: 2-2sqrt(7)<k<2+2sqrt(7)}
5a) f(x) = 1/4 x^4 - 3x^(-1/2)
b) x^5/20 - 6x^(1/2) + C
6a) Sub in x=-3 and set equal to 0. Rearrange for -3a+b = 5
b) a=-1, b=2
7a) profit would be negative
b) Max x = 145.81
c) a=450, b=-1, c=-130
di) £450,000
dii) £130
8) x = 21.1, 38.9, 81.1
9) use b^2-4ac=0, rearrange for q
10) x=5, only answer (reject x=-4)
11a) show that question, just find an equation for A and for V in terms of L and substitute one into the other.
b) 44.8cm
c) find second derivative to be 6pi > 0 thus minimum
d) £56.78
e) Assume you can pay for the exact amount used and not need to buy two whole sheets when only 1.89 are used.
12a) sketch a positive quadratic with roots at -3 and 0
b) dy/dx = 3x^2 + 9x
13a) h = 31 - 31.3e^(-0.0223t), {a = 31.3, k = 0.0223}
b) 31
ci) -0.3m
cii) Not suitable as the tree cannot have negative height
di) dh/dt = 0.69799e^(-0.0223t)
dii) 37.9 years (1 dp)
14a) p = 28k^2
b) pairs are (a=3, k=3/2) and (a=-23/3, k=5/6)
15a) Sometimes true
b) Never true
Credit to: @Jeff1527383
1i) A(-3,0) B(0,7) Asymptote y=3
ii) A(-1,0) B(2,-7) Asymptote y=-3
2a) y=4x+12
b) {y : 2x^2+5x-3 <= y < 4x+12}
3a) 2sqrt(10)
b) 47.6 degrees
4a)Centre (-5, 2), radius sqrt(28)
b) {k: 2-2sqrt(7)<k<2+2sqrt(7)}
5a) f(x) = 1/4 x^4 - 3x^(-1/2)
b) x^5/20 - 6x^(1/2) + C
6a) Sub in x=-3 and set equal to 0. Rearrange for -3a+b = 5
b) a=-1, b=2
7a) profit would be negative
b) Max x = 145.81
c) a=450, b=-1, c=-130
di) £450,000
dii) £130
8) x = 21.1, 38.9, 81.1
9) use b^2-4ac=0, rearrange for q
10) x=5, only answer (reject x=-4)
11a) show that question, just find an equation for A and for V in terms of L and substitute one into the other.
b) 44.8cm
c) find second derivative to be 6pi > 0 thus minimum
d) £56.78
e) Assume you can pay for the exact amount used and not need to buy two whole sheets when only 1.89 are used.
12a) sketch a positive quadratic with roots at -3 and 0
b) dy/dx = 3x^2 + 9x
13a) h = 31 - 31.3e^(-0.0223t), {a = 31.3, k = 0.0223}
b) 31
ci) -0.3m
cii) Not suitable as the tree cannot have negative height
di) dh/dt = 0.69799e^(-0.0223t)
dii) 37.9 years (1 dp)
14a) p = 28k^2
b) pairs are (a=3, k=3/2) and (a=-23/3, k=5/6)
15a) Sometimes true
b) Never true
(edited 8 months ago)
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Reply 1
Original post
by transparent-doorhow was the exam???
horrific
Reply 2
Original post
by kirsty200horrific
😭😭😭😭
Reply 3
Original post
by transparent-doorHow was the exam???
not great, some of the questions were SO bad - wdym sketch the curve of the gradient of a random cubic?!
Reply 4
Original post
by dghjghedjsdfewthnot great, some of the questions were SO bad - wydm sketch the curve of the gradient of a random cubic?!
NAHHH FR. I think I just drew a random positive quadratic.
Reply 5
Original post
by transparent-doorNAHHH FR. I think I just drew a random positive quadratic.
SAMEE, grade boundaries better be low this yr
Reply 6
Does anyone remember any of their answers
Reply 7
Original post
by AllbarknobiteDoes anyone remember any of their answers
I think I remember the exponential qs near the end A=31.3 and k=0.0223 or smt similar to that?
Reply 8
Original post
by transparent-doorI think I remember the exponential qs near the end A=31.3 and k=0.0223 or smt similar to that?
i got the exact same!
Reply 9
Exponential question was like 10 marks and if you couldnt get the first part, the whole 10 marks was down the drain. The binomial expansion 5 marker was making me regret my life choices
Reply 10
Original post
by kootayExponential question was like 10 marks and if you couldnt get the first part, the whole 10 marks was down the drain. The binomial expansion 5 marker was making me regret my life choices
the second part of the binomial question fried my brain, i couldnt even answer it
Reply 11
Original post
by dghjghedjsdfewththe second part of the binomial question fried my brain, i couldnt even answer it
Omds sameee I hadn't a clue what had happened 😭😂
Reply 12
Original post
by transparent-doorI think I remember the exponential qs near the end A=31.3 and k=0.0223 or smt similar to that?
I got the same but I refused to believe A was 31.3 (so close to 31 which was in the equation already) so I thought i got it wrong and gave up and didn’t do the rest of the questions 😭
Reply 13
Original post
by dghjghedjsdfewththe second part of the binomial question fried my brain, i couldnt even answer it
Reply 14
Original post
by OopsjuliaI got the same but I refused to believe A was 31.3 (so close to 31 which was in the equation already) so I thought i got it wrong and gave up and didn’t do the rest of the questions 😭
Oh noooo 😭tbh I had the same doubt at first but then I subbed it back in to the years and height they gave us to see if it worked.
Reply 15
The log question was x=5 only right?
Reply 16
Original post
by AllbarknobiteThe log question was x=5 only right?
yess thats what i got
Reply 17
Original post
by AllbarknobiteThe log question was x=5 only right?
I think so I rejected x=-4 so the only solution I kept was x=5.
Reply 18
What did everyone do for the last question the proof one
Reply 19
i couldnt get the circle ones even though i knew what to do but it just gave such weird numbers
also for the cylinder question i couldnt part a so thats 5 marks down the drain. and for the question where you had to find q=1.20(3-p)(3+p) where og equation had equal roots i think , what were u suppose to do?? i did the discriminant bc of the equal roots then what ??
also for the cylinder question i couldnt part a so thats 5 marks down the drain. and for the question where you had to find q=1.20(3-p)(3+p) where og equation had equal roots i think , what were u suppose to do?? i did the discriminant bc of the equal roots then what ??
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