Edexcel C1, C2 June 2013

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Guys have anyone done question 12 part b ? I've done it but my answer was different from the book. I wonder if its ne who done it incorrectly or text book have got answer mistake again. Please help please! My answer is 1959.86

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What's the answer in the book? (I cba to go and get it :tongue:

)

Reply 1181

jojo1616

Original post by jojo1616

For this ques how to do part c?
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Sry this would be the question

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1369235181571.jpg24.1KB

Reply 1182

Dilzo999

19

Original post by jojo1616

Sry this would be the question

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L2 is paralell to L1 so gradient = same. It tells us it passes through the midpoint AB so find midpoint of AB, make an equation of L2 then find co-ordinates of intersection with C and then use pythagoras.

Reply 1183

justinawe

19

Original post by May-o2q

Guys have anyone done question 12 part b ? I've done it but my answer was different from the book. I wonder if its ne who done it incorrectly or text book have got answer mistake again. Please help please! My answer is 1959.86

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Just tried it, I got 12079.98... what's the answer in the book?

Could you post your working, maybe?

Reply 1184

sceezy

can anyone help me answer question 9(ii) in edexcel C2 January 2012

Reply 1185

justinawe

19

Original post by sceezy

can anyone help me answer question 9(ii) in edexcel C2 January 2012

Try making simultaneous equations out of the info available.

Reply 1186

May-o2q

14

Original post by justinawe

Just tried it, I got 12079.98... what's the answer in the book?

Could you post your working, maybe?

ImageUploadedByStudent Room1369236628.401602.jpg

Hey u got the right answer, could u please post yr working too? It's my mistake then!

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Reply 1187

justinawe

19

Original post by May-o2q

Hey u got the right answer, could u please post yr working too? It's my mistake then!

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Your method is right, you just misread the question.

They're asking for the amount at the start of the 40th year, not the 14th.

Reply 1188

May-o2q

14

Original post by justinawe

Your method is right, you just misread the question.

They're asking for the amount at the start of the 40th year, not the 14th.

Silliest mistake ever :frown:

Thx u so much!!

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Reply 1189

Westeros

12

Original post by sceezy

can anyone help me answer question 9(ii) in edexcel C2 January 2012

Here are my workings.
You just set up simultaneous equations, you know the x coordinate of P and Q, so sub that into y=sin(ax-b) :smile:

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OP

Why am I wrong?

Original post by Alex-Torres

Why am I wrong?

I'm not too sure exactly what you did after

\log_3 (x-2) = - \log_3 3

\log_3 (x-2) = - \log_3 3 \Rightarrow \log_3 (x-2) = \log_3 3^{-1}

Can you see how to proceed here?

Reply 1192

jamesandrew93

7

Original post by Westeros

Here are my workings.
You just set up simultaneous equations, you know the x coordinate of P and Q, so sub that into y=sin(ax-b) :smile:

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This may sound stupid but where did pi come from in equation 2?

Reply 1193

justinawe

19

Original post by jamesandrew93

This may sound stupid but where did pi come from in equation 2?

\sin (\pi) = 0

Reply 1194

jadecross

Original post by justinawe

\sin (\pi) = 0

can you please help me?
The question is given

0<x<4

and

log_5 (4-x)-2log_5 x=1

find the value of x.

I did

log_5 4 - log_5 x -2log_5 x=1

which is then:

log_5 4 - log_5 x -log_5x^2=1

=>

log_5 (\frac {4}{x})=log_5x^2

now i'm stuck :frown:

(edited 10 years ago)

Reply 1195

Boy_wonder_95

15

C2 June 2009 was quite interesting.

Reply 1196

Kvothe the Arcane

20

Original post by Boy_wonder_95

C2 June 2009 was quite interesting.

How so?

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Reply 1197

Westeros

12

Original post by jamesandrew93

This may sound stupid but where did pi come from in equation 2?

If you look at the sin wave to the left of my working out, I've drew on P and Q, so basically you're working out how far they have shifted to the right. The equation when working out P equals 0 - because you're going from 0 to P, and the Q equation will equal pi, because you're going from pi to Q. That's how I look at it (might be wrong but I got the right answer :biggrin:

) And the highlighted bit should say Q not G :colondollar:

Did that make any sense at all?

Reply 1198

username963570

21

Original post by jadecross

how did you find January 2013 paper?

for C2 , that was SO easy it was unreal . the radians question took a bit of thinking , but i got full marks when i did it.

Reply 1199

username963570

21

Original post by lifeisgood2012

jan 2013 is soo nice... i really hope its going to be like that... btw what trig question are you one abt? the number 4 one? where there is a range for you to solve to???? did you find that hard?

nah bud , it was the last question on January 2012 ( i think ) and it gave a graph of sin ( ax -b ) and it gave the co-ordinates of the points where it crossed the x-axis ( in RADIANS aswell to make it just that bit harder ) and it said find the values of a and b and i was like ' whhhaaaaaaatttt the **** ' is going on here lol

Edexcel C1, C2 June 2013

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