Arsey's S15 FP1 Model Answers (attached to 1st post)

Here you go FP1 fans

I thought that was quite tricky in places.

I doubt I have used the most efficient methods as mine seemed too long on a couple.

Boundaries, no idea, probably a bit lower than normal.

S15 FP1 Model red.pdf963.1KB

Reply 1

BBeyond

15

Original post by Arsey

Here you go FP1 fans

I thought that was quite tricky in places.

I doubt I have used the most efficient methods as mine seemed too long on a couple.

Boundaries, no idea, probably a bit lower than normal.

cheers m8.

how many marks would i drop if i got to the final quadratic on q and got 12+6i/18 which is right but then simplified it wrong?

(edited 8 years ago)

Reply 2

Mattematics

5

Thanks for doing this, Arsey. Couple of questions I have about marks I've lost - greatly appreciate it if you can give me your guesses as to how many marks I'd gain for each of these questions (know you've had a long day, sorry):

6) a) Went straight from (-1/4(5^k - 1) - 5^k) to (-1/4(5^(k+1) - 1)). Lose any marks for not showing rearranging it to be -5/4 etc?

6) b) Second part of induction - did basis, assumption and started n=k+1 correctly but couldn't get (k+1) out as a factor. Finished with just writing down Sum(K+1) = what they asked for. Assuming 2 marks for basis and starting n = k+1. Gain another method mark for conclusion or no?

7) Worked out B^-1 correctly (with correct determinant) but then (god know's why :/) calculated it a second time incorrectly. I did 30-15 instead of 30--15, resulting in 2c = 9 and c= 9/2. Lose all the marks, or gain one for method?

8) a) Did
SP = root((3p^2-3)^2 + (0-6p)^2)
SP = root(9p^4 - 18p^2 + 9 + 36p^2)
SP = 3p^2 + 18p + 3

and left it like that. Any marks out of the 3?

8) b) Worked out the equation of the tangent at p correctly (py - x = 3p^2), then said equation of tangent at q would be (qy - x = 3q^2). Made x the subjects and equalled them to each other, then attempted to solve (ended up with incorrect answer). Any idea how many marks out of 8?

Thanks so much!

Reply 3

Xin Xang

14

Yay the King has arrived. All hail King Arsey. :biggrin:

Cheers Arsey

OP

I have other work to do, so I will not be able to answer any questions tonight but if you are asking how many marks would i... look on past papers and MS, you'll find what you need.

Reply 6

AQUF42

2

Thanks mate
My son has got all of them right
Cheers

Reply 7

Jelly150

9

Isn't arg of z supposed the be -pi/3?
Or was I wrong?

Posted from TSR Mobile

Reply 8

edothero

15

I'm going to post this again as I didn't get a solid reply on the other thread:

In the first Induction question [Matrices]
I showed

\dfrac{-5^{k}}{(-\dfrac{1}{4})} = 20^{k}

which I then quite stupidly went on to saying

= 4(5^{k})

My teacher said the mark scheme allows one algebraic mistake, is this true?
because I then done

-\dfrac{1}{4}[5^{k}+4(5^{k})-1]

\rightarrow

-\dfrac{1}{4}[5(5^{k})-1]

which then went on to being

-\dfrac{1}{4}[5^{k+1}-1]

(edited 8 years ago)

Reply 9

Baldwinator

1

Thank you big time arsey

Reply 10

Mina Makin

For Q7 i left the coordinates in a matrix form, would i lose a mark?
Also for 4c) i wrote z3 not z1+z2 but drew it correctly, would i lose a mark on that?
Finally for the induction i did n=1 and found n=k but couldnt do the rest, how many marks would i get? 2 or 3?

Thanks a lot

Reply 11

JoshC98

15

Original post by Jelly150

Isn't arg of z supposed the be -pi/3?
Or was I wrong?

Posted from TSR Mobile

He put that, small writing with a * next to it :smile:

Reply 12

TirnanF

3

I put 3i on x axis instead of the y axis, will I lose just 1 out of the 2 marks?

Posted from TSR Mobile

Reply 13

StarvingAutist

17

Awesome, I reckon I dropped one mark :smile:

will I still get 100 UMS, do you think?

Reply 14

TeeEm

19

Having seen the paper and solutions I feel as I mentioned earlier that A will be at around 60.
This is also backed up by the thread with the poll as to how people found it.

Reply 15

aero-1997

2

Arsey thank you sooo much 75/75 so happy. :biggrin:

Reply 16

econam

11

Thank you!! I think I did alright :smile:

Reply 17

edothero

15

Original post by edothero

I'm going to post this again as I didn't get a solid reply on the other thread:

In the first Induction question [Matrices]
I showed

\dfrac{-5^{k}}{(-\dfrac{1}{4})} = 20^{k}

which I then quite stupidly went on to saying

= 4(5^{k})

My teacher said the mark scheme allows one algebraic mistake, is this true?
because I then done

-\dfrac{1}{4}[5^{k}+4(5^{k})-1]

\rightarrow

-\dfrac{1}{4}[5(5^{k})-1]

which then went on to being

-\dfrac{1}{4}[5^{k+1}-1]

Original post by TeeEm

Having seen the paper and solutions I feel as I mentioned earlier that A will be at around 60.
This is also backed up by the thread with the poll as to how people found it.

^^ I'm dying for an answer lmao, help :afraid:

Reply 18

econam

11

Original post by TeeEm

Having seen the paper and solutions I feel as I mentioned earlier that A will be at around 60.
This is also backed up by the thread with the poll as to how people found it.