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# Edexcel Maths FP1 UNOFFICIAL Mark Scheme 19th May 2017 watch

1. (Original post by Joanna Chan)
i got a=9/2 but i know i missed one more possible value of a, but i dont know how do you guys get a might also equals to -27/2?
Image= obj times the modulus of determinant of a so det can equal plus or minus 18
2. (Original post by robinhood111)
for the matrices question how many marks do i lose if i only got 9/2 ???
i'm guessin you only lose 2 marks out of the 5
3. (Original post by DystopiaisReal)
Could someone please explain why for 4b p=20?? If arg(w)=0.25pi, doesn't that mean 2p+12=3p+8?
it was 3p-8 ^^
4. (Original post by Joanna Chan)
i got a=9/2 but i know i missed one more possible value of a, but i dont know how do you guys get a might also equals to -27/2?
Suppose we have a linear transformation

is the 2 x 2 matrix which mapped the triangle T, to the triangle T'.

It can be shown that iff T is a linear mapping, then Area of the original shape the area of the new of the shape. However, recall that can be negative and in that case would produce a negative area. Area cannot be negative and thus we include a modulus sign.

So...

Area of the original shape the area of the new of the shape

I think in that question we had

so p is the solutions to the following equations and
5. (Original post by Apachai Hopachai)
Suppose we have a linear transformation

is the 2 x 2 matrix which mapped the triangle T, to the triangle T'.

It can be shown that iff T is a linear mapping, then Area of the original shape the area of the new of the shape. However, recall that can be negative and in that case would produce a negative area. Area cannot be negative and thus we include a modulus sign.

So...

Area of the original shape the area of the new of the shape

I think in that question we had

so p is the solutions to the following equations and
wrong!! completely false!1!11!!
Spoiler:
Show

jk, but the matrix was m and the variable was a

6. (Original post by Apachai Hopachai)
Suppose we have a linear transformation

is the 2 x 2 matrix which mapped the triangle T, to the triangle T'.

It can be shown that iff T is a linear mapping, then Area of the original shape the area of the new of the shape. However, recall that can be negative and in that case would produce a negative area. Area cannot be negative and thus we include a modulus sign.

So...

Area of the original shape the area of the new of the shape

I think in that question we had

so p is the solutions to the following equations and
I just equated it to both 18 and minus 18, quicker than multiplying brackets.
7. (Original post by 04MR17)
Question 4: Complex Numbers
i.) a.) ((2p+2)/13) + ((3p-8)/13)i [3]
b.) p=20 [2]
ii.) +/- 4sqrt(5) [3]
sorry i cannot remember what was the question for ii.)?
8. (Original post by k.russell)
wrong!! completely false!1!11!!
Spoiler:
Show

jk, but the matrix was m and the variable was a

Yeah, I've forgotten all the questions already lol.

This still could be wrong though, I don't know, if that little fact holds for non-linear transformations...
9. (Original post by Wendy_ZHANG)
sorry i cannot remember what was the question for ii.)?

or something like that
10. (Original post by Apachai Hopachai)

or something like that
THANKS SO MUCH!! I was slightly lost!! =.=
11. (Original post by Apachai Hopachai)

or something like that
pretty sure it was 45
12. (Original post by glad-he-ate-her)
pretty sure it was 45
Probably
13. (Original post by Apachai Hopachai)

or something like that
are you sure it was equal to 25? not something else???
14. (Original post by Apachai Hopachai)
nah defo 25
No it was definitely 45

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15. (Original post by goatfarmer)
No it was definitely 45

Posted from TSR Mobile
ok then it was 45
16. (Original post by 04MR17)
Question 5 Matrices
i.) a.) ((12-5p) (4p-10))
..........((6p-15) (12-5p)) [2]
b.) p=1.5, k=7.5 [4]
ii.) a=4.5 [5]
or a=-13.5
17. (Original post by Apachai Hopachai)
ok then it was 45
thanks guys, i thought it was 45,
18. (Original post by diogenesax)
Can someone explain how k was 2/9?
You had to use geometric series: C2 style. I didn't spot that and decided to substitute the whole thing for that term. Don't know if I'll get the marks.
19. (Original post by 04MR17)
Question 4: Complex Numbers
i.) a.) ((2p+2)/13) + ((3p-8)/13)i [3]
b.) p=20 [2]
ii.) +/- 4sqrt(5) [3]
It wanted simplest form so a should be:
(2(p+6)/13) + ((3p-8)/13)i
20. (Original post by 04MR17)
Question 4: Complex Numbers
i.) a.) ((2p+12)/13) + ((3p-8)/13)i [3]
b.) p=20 [2]
ii.) +/- 4sqrt(5) [3]
lplp

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