OCR A-level Further Mathematics B (MEI) Core pure - 22nd May 2025 [Exam Chat]

Reply 40

Freddo-15p

1

Original post

by beepboop3308

ive been silly hahahaha i was looking at A

How much marks do you reckon it’ll be for a B

Reply 41

Walkablecities

12

To get the k+1 part you had to chain rule (1+x)^-k and that gave you -k(1+x)^(k+1) and the -1 multiplied with the (-1)^k-1 or whatever it was and the k multiplied with the (k-1)! to give k!

Reply 42

wdgyjhba

7

Original post

by WDEVE131313242

Do people think 100 is enough for an A that was really hard :frown:

truthfully honest? nah but it would be close. also u almost defo did better so u may have scraped an A

Reply 43

Jani12345

6

Is 130 enough for an A* also for the proof of induction did we need a conclusion I completely forgot about it

Reply 44

kicats

8

Original post

by Jani12345

Is 130 enough for an A* also for the proof of induction did we need a conclusion I completely forgot about it

You always need a conclusion for proof by induction, but you probably on lose 1 mark not for having one and 130 is probably enough for an A *

Reply 45

beepboop3308

4

Original post

by Jani12345

Is 130 enough for an A* also for the proof of induction did we need a conclusion I completely forgot about it

it would probably be 1 mark, it normally is so ur probably okay without it

Reply 46

oceanb1ue

12

what would need to be said to score all 6 marks for the rhombus question

Reply 47

kicats

8

Original post

by oceanb1ue

what would need to be said to score all 6 marks for the rhombus question

Show all the lengths are equal, and that the area is still 1

Reply 48

Jani12345

6

What I did for the matrix question is that I did the transformation times the unit matrix, but I did the 2 by 4 unit matrix and then, worked out dtsnace from origin to 2 points and then from the end of the 2 points to the last point. And showed all the distances are equal , how many marks is that

Reply 49

oceanb1ue

12

Original post

by kicats

Show all the lengths are equal, and that the area is still 1

i did that but do you need to show anything to do with it being a parallelogram/ diagonal perpendiculars bisect or whatever

Reply 50

kicats

8

Original post

by oceanb1ue

i did that but do you need to show anything to do with it being a parallelogram/ diagonal perpendiculars bisect or whatever

No I don’t think so because mathematically speaking if you have a shape where all 4 sides are equal it’s must be rhombus so that’s the only thing you have to prove

Reply 51

kicats

8

Original post

by Jani12345

What I did for the matrix question is that I did the transformation times the unit matrix, but I did the 2 by 4 unit matrix and then, worked out dtsnace from origin to 2 points and then from the end of the 2 points to the last point. And showed all the distances are equal , how many marks is that

Did you talk about the area ?

Reply 52

beepboop3308

4

Original post

by Freddo-15p

Sorry but did anybody understand that proof by induction question, I think it had something to do with maclaurin series but that’s my worst area in pure 😭😭

yeah you'd have to practice with other exam boards to get it so its a bit mean. check out edexel papers or ocr A ones if u wanna see. it works the exact same as all proof by induction tho.

basically you differentiate f(x)=ln(x+1) once to get the first derivative, then plug n=1 into the f^n(x) expression from the question and it should be the same so thats how you prove its true for n=1.

then you assume true for n=k and plug n=k into f^n(x) to get f^k(x). the next step is differentiating your f^k(x) expression to get f^(k+1)(x). you then need to rearrange that to make it clear that its the same as if you were to sub n=k+1 into f^n(x).

then your conclusions the exact same.

Reply 53

Jani12345

6

Yes I said it was 1 but I didn't work it out properly

Reply 54

Walkablecities

12

Original post

by kicats

Did you talk about the area ?

I just said the determinant is 1 (cosh²x-sinh²x=1) so the area and orientation are preserved

Reply 55

oceanb1ue

12

Original post

by kicats

No I don’t think so because mathematically speaking if you have a shape where all 4 sides are equal it’s must be rhombus so that’s the only thing you have to prove

ok thank you thats a relief

Reply 56

kicats

8

Original post

by Walkablecities

I just said the determinant is 1 (cosh²x-sinh²x=1) so the area and orientation are preserved

Did you mention the unit square had an area of 1 ?

Reply 57

Jani12345

6

What mark do you guys think you got

Reply 58

Walkablecities

12

Original post

by kicats

Did you mention the unit square had an area of 1 ?

I didn't

Reply 59

kicats

8

Original post

by oceanb1ue

ok thank you thats a relief

That’s what my teacher told me after the exam to I’m assuming that’s correct, and if it’s not it’s at least like 4 of the 6 marks

OCR A-level Further Mathematics B (MEI) Core pure - 22nd May 2025 [Exam Chat]

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