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CCEA C3- 13th May 2014

Hey, does anyone have this exam tomorrow? How do you think it'll go?
Yess any suggestions on what will come up?
Reply 2
Avatar for SandraMR
SandraMR
1
Does anymore remember their answer to the fish drawing question? I didn't get any x^2 terms so I just said b=0

The question was

X=3t^2 Y=3t-t^3

Can be written as Cartesian equation

Y^2= ax^3+bx^2+cx

Find a, b and c
Reply 3
Avatar for Conor3669
Conor3669
What were the answers for questions about the binomial and the partial fractions. They were question 4 and 3.
(edited 8 years ago)
Reply 4
Avatar for Fox123
Fox123
1
Original post by Conor3669
What were the answers for questions about the binomial and the partial fractions. They were question 4 and 3.


A was -1/2 and N was 1/2 for the binomial anyway
I didn't get any x^2 terms either
I didn't get an x^2 term either!
As for the partial fractions A was 1 B was 1 and C was -2 if I remember correctly
The partial fractions was 1/(x+2) - 2/(x+1)^2

The Cartesian equation was a = 1/27, b = -2/3 and c = 3


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Original post by Hollienikita
The partial fractions was 1/(x+2) - 2/(x+1)^2

The Cartesian equation was a = 1/27, b = -2/3 and c = 3


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Yeah I got the same
What did everyone get for the differentiation?


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I got b = 0, how did everyone find the binomial expansion. Didn't get any answer but wrote down an incorrect method
Original post by jamesjmillar
I got b = 0, how did everyone find the binomial expansion. Didn't get any answer but wrote down an incorrect method

The binomial expansion was:

(1+ax)^n = 1+anx + (n(n-1))/2! (a^2)(x^2)

Or something along these lines I can't remember the question exactly or what each term equaled but then I just set an=(x term)
n=(x term coefficient)/a
And then worked it out I think.
I did get a=1/2 and b=-1/2

For the normal to the curve I did tangent, how many marks do you think I'll lose because of that?
Original post by SandraMR
The binomial expansion was:

(1+ax)^n = 1+anx + (n(n-1))/2! (a^2)(x^2)

Or something along these lines I can't remember the question exactly or what each term equaled but then I just set an=(x term)
n=(x term coefficient)/a
And then worked it out I think.
I did get a=1/2 and b=-1/2

For the normal to the curve I did tangent, how many marks do you think I'll lose because of that?


I did the tangent too 😩 hoping it won't be a lot of marks!


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Does anyone have an unofficial mark scheme?
The answer was (9,0) I think for the Cartesian question
Reply 15
Avatar for Keith.
Keith.
OP
Original post by Annemary
The answer was (9,0) I think for the Cartesian question


sounds good! That's what I got :smile:


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Reply 16
Avatar for Keith.
Keith.
OP
I assume everyone here is doing C4 on the 26th too? :tongue:


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Original post by Keith.
I assume everyone here is doing C4 on the 26th too? :tongue:


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Yep!




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Reply 18
Avatar for Keith.
Keith.
OP
Hey everyone, I just made this thread for Core 4 on Tuesday. :smile:

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