AS Level OCR MEI Further Maths Core Pure

Glad to hear I'm not the only one who found that exam really hard! I didn't get very far at all on the last vectors question but I think there's a chance I got the argand second to last question with the complex numbers. Did anyone figure out how to do Q3 summing series?

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Not looking forward to mechanics on Friday... 😬

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Original post by hattiemiles

Was this ocr?

OCR B MEI. Reading back what I wrote I don't think the vectors question actually was the last one on the paper though haha.

Reply 4

Ellien19235

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Original post by comicsans321

OCR B MEI. Reading back what I wrote I don't think the vectors question actually was the last one on the paper though haha.

Yeah the vectors one was the last one for me. I ran out of time 😓 also what did you get for the value of k for the area and orientation is preserved question i have no idea if i did it right. (I got something like -2)

Reply 5

magnusln4

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Original post by oljo888

Couldn’t see a thread for this one.If any other living soul took this paper how did you find it?I absolutely fumbled. Fumbled summations, fumbled the Argand thing, fumbled the last one. I even fumbled intersection of planes because I entered the matrix wrong on my calculator leading me to get Det M = -10 instead of Det M = 0

It was terrible. Everyone from my class said so, don’t worry!!

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Original post by Ellien19235

Yeah the vectors one was the last one for me. I ran out of time 😓 also what did you get for the value of k for the area and orientation is preserved question i have no idea if i did it right. (I got something like -2)

I definitely got a value that was non-zero, sorry I can't remember what it was though. What I wrote (which is probably wrong) is that since it was non-zero the planes must intersect at a single point, and since we are told that they intersect at the origin they can't intersect at any other point.

Reply 7

rohin1

4

for the 2nd to last question i got -6+13i im pretty sure, anyone else get that? i forgot what a unit vector was ugh and the summations was was horrid why cldnt they have just given a normal one!?!?

Reply 8

OP

Original post by comicsans321

Glad to hear I'm not the only one who found that exam really hard! I didn't get very far at all on the last vectors question but I think there's a chance I got the argand second to last question with the complex numbers. Did anyone figure out how to do Q3 summing series?

you were meant to do 1/4 (4n^2)(2n+1) - 1/4 (n^2)(n+1) i believe, according to my friend who managed to get a solvable quadratic (i did not get a solvable quadratic in any way)

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Original post by oljo888

you were meant to do 1/4 (4n^2)(2n+1) - 1/4 (n^2)(n+1) i believe, according to my friend who managed to get a solvable quadratic (i did not get a solvable quadratic in any way)

Ah okay, I certainly didn't do that; oh well. Fingers crossed for some low grade boundaries now.

Reply 10

Ellien19235

1

Original post by oljo888

you were meant to do 1/4 (4n^2)(2n+1) - 1/4 (n^2)(n+1) i believe, according to my friend who managed to get a solvable quadratic (i did not get a solvable quadratic in any way)

Yes I did that you sub in 2n for any ns in the equation and I got the answer.

Reply 11

Ellien19235

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Original post by rohin1

for the 2nd to last question i got -6+13i im pretty sure, anyone else get that? i forgot what a unit vector was ugh and the summations was was horrid why cldnt they have just given a normal one!?!?

I’m pretty sure it’s a vector of magnitude 1 so I just did vector (0,1)? Don’t know if that’s right though.

Reply 12

OP

Original post by Ellien19235

I’m pretty sure it’s a vector of magnitude 1 so I just did vector (0,1)? Don’t know if that’s right though.

iirc that was for the last question, not second to last

Reply 13

JohnMcgjnn

Original post by oljo888

you were meant to do 1/4 (4n^2)(2n+1) - 1/4 (n^2)(n+1) i believe, according to my friend who managed to get a solvable quadratic (i did not get a solvable quadratic in any way)

After going back over the question the answer I got for the summations was 1/4 (n^2) (3n+1) (5n+3)

Reply 14

JohnMcgjnn

Original post by Ellien19235

Yeah the vectors one was the last one for me. I ran out of time 😓 also what did you get for the value of k for the area and orientation is preserved question i have no idea if i did it right. (I got something like -2)

For the preserved orientation and shape question, the determinant of the 2 matrices has to be 1 (since the orientation and shape is the same after the transformation), and since we get given one of the matrices determinant is 3, the other must be 1/3 which allow you to find k which I got to be -4/3

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rohin1

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Original post by JohnMcgjnn

For the preserved orientation and shape question, the determinant of the 2 matrices has to be 1 (since the orientation and shape is the same after the transformation), and since we get given one of the matrices determinant is 3, the other must be 1/3 which allow you to find k which I got to be -4/3

i thought the determinants added together 😭😭 ugh

Reply 16

OP

Original post by JohnMcgjnn

For the preserved orientation and shape question, the determinant of the 2 matrices has to be 1 (since the orientation and shape is the same after the transformation), and since we get given one of the matrices determinant is 3, the other must be 1/3 which allow you to find k which I got to be -4/3

i got -4/3 as well, initially thought i’d got that one wrong but maybe not

Reply 17

OP