Edexcel A Level Further Mathematics Paper 3A (9FM0 3A) - 22nd June 2023 [Exam Chat]

Can anyone tell me how to do the vectors question for Part A? Really annoyed me, I knew how to do everything in the question except the first bit, but everything else relied on having the coordinates for B and C...

Reply 85

parth_132005

1

Original post by moheat13

Can anyone tell me how to do the vectors question for Part A? Really annoyed me, I knew how to do everything in the question except the first bit, but everything else relied on having the coordinates for B and C...

You needed to find the general equation of the line l to A and then say that 15 is equal to the square root of the three conponents squared, solve for lambda and then sub that back in....i got lambda is -2 and -1

Reply 86

Literally same, no clue how to find the co-ordinates so i made my own up lol. I tried 5 different ways to find B and C. I had 30 mins for that questions ffs. Praying for method marks

Original post by moheat13

Can anyone tell me how to do the vectors question for Part A? Really annoyed me, I knew how to do everything in the question except the first bit, but everything else relied on having the coordinates for B and C...

Reply 87

moheat13

Original post by Labradoodle1

Same but ugh I forgot my +c

"+c" yknow, that thing don't exist in my books

Reply 88

Maximus_2005

can anyone at least remember the equation of the line that you lot got in part a of the vectors question?

Reply 89

(r - (7i +13j - 24k)) x (3i + ?j + 9k)

i think but probs wrong

Original post by Maximus_2005

can anyone at least remember the equation of the line that you lot got in part a of the vectors question?

Reply 90

Anonymous :p

5

Did anyone else get 4.4 for the last part of the vectors question (shortest distance)

Reply 91

YARE YARE. If the equation of a line is (r-a)×b=0, then r-a is parralel to b, r-a=cb, c is a scalar. r=a+cb, a,b vectors and c scalar.

(edited 10 months ago)

Reply 92

Original post by Anonymous :p

Did anyone else get 4.4 for the last part of the vectors question (shortest distance)

ye

Reply 93

Labradoodle1

16

The vectors question being 15 marks that you couldn't get if you didn't understand how to do part a was extremely harsh imo

Reply 94

parth_132005

1

Original post by LucrativeHelper

(r - (7i +13j - 24k)) x (3i + ?j + 9k)

i think but probs wrong

Were you supposed to put it in (r-a)xb form????? I just left it as r = a + lambda(b)

Reply 95

Original post by parth_132005

Were you supposed to put it in (r-a)xb form????? I just left it as r = a + lambda(b)

that was given in the question (cross prodcut form)... i thought FP1 STUDENTS would be smarter than this...

(edited 10 months ago)

Reply 96

oh nah lol thats just the question ahaha thought u asking what the line was

Original post by parth_132005

Were you supposed to put it in (r-a)xb form????? I just left it as r = a + lambda(b)

Reply 97

Do you guys think marks would be possible if you made up B and C lol asking for a friend....

Reply 98

Labradoodle1

16

Original post by qftroon

that was given in the question (cross prodcut form)... i thought FP1 STUDENTS would be smarter than this...

No need to be so condescending.

Reply 99