Differential Equations 4 • Particular Integrals• CP2 Ex7C • 🏆

Edexcel Core Pure Year 2

Weds 12/2/20

[sirobi]

I swear to god these adverts. I’m trying to skip through and rewind on different bits and I’ve seen 10 adverts in like 5 minutes

[JustinBieberFan]

Hey sir, I've got another question again - I was doing a past paper question which required me to find the general solution of a second-order differential equation. The auxiliary equation I had was m = 2 and 1/2, both of which was same with the solution. However, in my answer, the order of the roots were different from that of the solution's. What I mean is that I had the order of Ae^(2t) + Be^(0.5t), but the question had Ae^(0.5t) + Be^(2t). This eventually led to me swapping all the A's and B's in the latter parts of the questions. Will I still be given marks in this case? Thanks sir!

[saferehman]

IDK if u remember me from before in your comments but I wanted to know I smashed the Maths and Further Maths test because of you, even the questions I wouldn't expect you taught so I think I got 96% or so :) and Im watching you again in Uni as Ive forgotten everything xD

[EthanBurkinshaw-nmvp]

45:43 this actually came up in one of the mock set papers (Paper 2 Q8 I believe)

[terrencemayne]

Sir, will it always be obvious when to add the x or x^2 to the P.I.? Like will it always not work in cases where you need to add the x but you don't?

[riadmathsy]

hi sir how do i know which part of thr complementary function would have which m value because sometimes its Ae^2x + Be^3x
and sometimes it can be Ae^4x+Be^2x or smth
idk how to determine which m value goes with which?

[mrfreerunners]

Sir, Q1C in the exercise 7C, the solution says to use lambda e^2x as their PI ?

[ozone]

Can you have compound functions for particular integrals e.g. some differentials = (3+5x)e^2x?

[BBK]

At 13:25 don't the arguments have to be same inside cos and sin so wouldn't they both be "bx" like

a cos (bx) + c cos (bx)?

instead of a cos (bx) + c cos (dx)

[generation]

at 43:50 why cant u put the 3 to the other side and do it normally

[BBK]

Hi Sir, at 36:05 and the last example, instead of adding, you multiplied, is this the same for all of them or was multiplying an exception here?

[BBK]

oh wait at 46:40 do you say the multiplying by x² probably wont be in core pure stuff?

[jackclifford]

hi sir will you be uploading any FP1 before the exams?