STEP Blog of Virgin Duke

OP

Update: I finished a mock yesterday and also have tried STEP 3 1998. I am still not sure whether to write STEP 3 or not as I find it extremely difficult.

Spoiler

(edited 8 years ago)

Reply 42

Number Nine

12

Original post by Duke Glacia

Update: I finished a mock yesterday and also have tried STEP 3 1998. I am still not sure whether to write STEP 3 or not as I find it extremely difficult.

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Yay

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Reply 43

Original post by Number Nine

Yay

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stop being mean

Reply 44

Number Nine

12

Original post by Zacken

stop being mean

Piff

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Reply 45

OP

Original post by Zacken

stop being mean

How much would you cut for not showing that x=4 is invalid and x=0 is invalid in Q 1 STEP 2 2004(and writing X=4,1,0 for all three) ? and how much mark for solving part (i) of Q8 ???

Reply 46

Original post by Duke Glacia

How much would you cut for not showing that x=4 is invalid and x=0 is invalid in Q 1 STEP 2 2004 ?

4/5 marks. IIRC, x=0, 1, 4 are solutions to the first part. x=1,4 or 0,1 are solutions to the second one and x=0,1 or 1,4 (basically the opposite of the second one) are the solutions for the third one.

and how much mark for solving part (i) of Q8 ???

4 marks.

Reply 47

OP

Original post by Zacken

4/5 marks. IIRC, x=0, 1, 4 are solutions to the first part. x=1,4 or 0,1 are solutions to the second one and x=0,1 or 1,4 (basically the opposite of the second one) are the solutions for the third one.

4 marks.

3 marks cut for the first one ? as i showed working ??? :redface:

Reply 48

Original post by Duke Glacia

3 marks cut for the first one ? as i showed working ??? :redface:

Sorry, not sure what you're asking?

Reply 49

OP

Original post by Zacken

Sorry, not sure what you're asking?

Q1 i need one more zacken jsut one more point :cry:

Spoiler

Reply 50

Original post by Duke Glacia

Q1 i need one more zacken jsut one more point :cry:

Spoiler

Give yourself 5 marks for Q8(i), I suppose. :tongue:

Reply 51

OP

PDATE:

STEP 2 2004 Mock 98/120 S

A very nice paper. And I understood the significance of going thoroughly through each question before attempting it. Choice of question really matters.

Q1, 15/20 I thought this was a very easy question but in the end I lost most marks on this. Didnt realize that x=4,0 are invalid for some cases.

Q2, 19/20 Drew the graph but forgot the asymptote. At first the question seemed very complex and hard to understand but once u get it its fine.

Q3, 20/20 I spent most time on this question apparently because i was confused whether x=2 is a stationary point or not. (As the second deri was zero but also the third deri)

Q5,20/20 Pretty tricky imho. And im still not satisfied with substituting x inplace of t(though i just did it in the mock)

Q8 4/20

Q11, 20/20 I thought power question was easy but after the mock i realised that q9 was easier and quicker to do.

(edited 8 years ago)

Reply 52

Original post by Duke Glacia

Q3, 20/20 I spent most time on this question apparently because i was confused whether x=2 is a stationary point or not. (As the second deri was zero but also the third deri)

If the first derivative is zero, then the point is a stationary point. These stationary points could be any of (i) a maximum (ii) a minimum (iii) an inflection point. If the second derivative is zero, then it is an inflection point unless the third derivative is also zero. In which case you need to investigate signs for the nature of the stationary point.

Reply 53

OP

Original post by Zacken

If the first derivative is zero, then the point is a stationary point. These stationary points could be any of (i) a maximum (ii) a minimum (iii) an inflection point. If the second derivative is zero, then it is an inflection point unless the third derivative is also zero. In which case you need to investigate signs for the nature of the stationary point.

sorry i was confused whether its a min point or a point of inflexion. Lokking at the dy/dx(after and before x=2) told me that it should be a min point but looking at the second deri told me it might be an point of inflexion but the third deri told me its not so. So i thought i went wrong with the algebra, :tongue:

Thnx m8

(edited 8 years ago)

Reply 54

Original post by Duke Glacia

sorry i was confused whether its a min point or a point of inflexion. Lokking at the dy/dx told me that it should be a min point but looking at the second deri told me it might be an point of inflexion but the third deri told me its not so. So i thought i went wrong with the algebra, :tongue:

Yes, that's what I'm saying. The second derivative being zero means it's a point of inflection unless the third derivative also vanishes at that point. In which case the second derivative reveals nothing about the nature of the point and you should only look at the first derivative.

Reply 55

OP