This URL takes you to the formula book which you get in the exams. Might be useful when you’re revising so you can see exactly what is there – and, more importantly, what is NOT there! Have fun 
http://www.edexcel.com/migrationdocuments/GCE%20Curriculum%202000/N38210A-GCE-Mathematical-Formulae-Statistical-Tables.pdf
Raslyn,
No. d/dx of ln(ax) = 1/x
JT
thank you for all your help so far!
i am currently suck on an integration question from the pack you gave us during class. it is question 8 and begins ‘a population growth is modelled by the differential equation dP/dt = kP
please may i have some help with part a
thank you
Jacynth
Hi Jacynth,
Separate the variables so you get dP/P = kdt
stick integral signs in front of them both
integrate and don’t forget the constant!
JT
PS We’re teaching year 7 period 2 tomorrow, but 1 and 3 we’re free.
For question 8 on paper j
it says:
f(x)= x(3x -7)/(1-x)(1-3x)
find the values of A,B and C such that:
f(x)= A + B/(1-X)+C(1-3X)
isn’t f(x) top heavy? i factorized out the top and bottom and then did long division but they didn’t do this in the answers they said that
x(3x-7)=A(1-x)(1-3x)+B(1-3x)+C(1-x)
i don’ understand why?
Megan
Hi Megan,
in your second f(x)= , replace f(x) on the left with the algebraic fraction from the beginning, then multiply throughout by the 2 brackets.
Does that help?
JT
I understand what you have done, but why do you do that?
How comes you do not divide the bottom into the top to make it not top heavy?
Meg
Either way is fine. It leads to the same end result. Use whichever method you’re happiest with.
o okay, i think i did the division wrong and that was why i was getting confused!
Thanks for your help