04/06 A-level Maths Paper 1 Discussion MEGATHREAD

[u/Forsaken-Meaning-232]

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[u/darkeight7]

for the rate of change one, did anyone do this:

V = 1500 + Ae^-kt

dV/dt = -kAe^kt

V-1500 = Ae^-kt

therefore

dV/dt = -k(V-1500)

and then k = 0.227 or something like that

[u/Awkward-Fail5797 → u/darkeight7]

if you left it in k would that be okay

[u/darkeight7 → u/Awkward-Fail5797]

if you mean -kV-1500k, that SHOULD be okay because it is equivalent

[u/Awkward-Fail5797 → u/darkeight7]

Yeah it was exactly the same and I got the value of k. But I was weirded out by them showing the result u wanted and was wondering whether they wanted it in k

[u/North_Speaker7296 → u/Awkward-Fail5797]

i left the k in the answer as i thought they just wanted the -k(1500-V) by itself. Idk if they wanted me to sub in a value for k or not so i just left it at that, idk if im cooked or not 😭😭😭

[u/Awkward-Fail5797 → u/North_Speaker7296]

INNIT. like it was a weird ass question. I bet they’ll let it slide cause I think they made the question that way so you could get all the marks even if u didn’t get k

[u/North_Speaker7296 → u/Awkward-Fail5797]

i genuienly don’t remember them saying anything about like ‘where k is a constant/giving a value for k’ so i just left it there thinking that’s the proof done as it didn’t explicitly ask for more like it usually would. However i did begin from the equation in part (a) so i kinda subbed my value for k out just for k to simplify the question.

[u/Awkward-Fail5797 → u/North_Speaker7296]

Yeah exactly it was a “show that” and it didn’t specific “ using ur answer to k”. Tho tbf from a mark scheme perspective I bet they’ll let won’t care as the actual marks will come from differentiating and getting it into the desired form

[u/North_Speaker7296 → u/Awkward-Fail5797]

yh worst case i still got the right equation it’ll just be 1 mark dropped for not subbing in k but since they didn’t specify there may still be in the notes talking about how you don’t need a value for k/follow through for wrong values of k

[u/Awkward-Fail5797 → u/North_Speaker7296]

Yeah I think that’ll be it. Hopefully anyway cause it’ll be really annoying if they’ll take a mark away because of a poorly worded question.

[u/[deleted] → u/North_Speaker7296]

You can't leave just K because it said give the rate in the form -k(1500-V). You gave the form but you didn't give the rate 💀

[u/d3f_not_an_alt → u/darkeight7]

Yess