Edexcel FP1 Thread - 20th May, 2016

Reply 1260

LewisClothier

6

Original post by thelegend99

Wasn't the Modulus 5? Cause the imaginary part was 0, and the real part was (-5). :/ not sure now.

not sure, i think z = -1 + 2i or something, so it was pythag on that for root 1^2 +2^ hence root 5

Reply 1261

sasrosa

1

for the show that the point A is (-5/p + 5p, 5/p -5p), I started to try and solve for x, but got stuck, but did most of the correct method for it until right at the end I couldn't get rid of one constant, but used their value of X to find y, how many marks out of the 3 would this get me?

Reply 1262

ombtom

17

Definitely harder than usual, but not impossible.

Here are a few of my answers that I can remember:

k = +/-\sqrt2/2

12.468
a = 38, b = 15, c = 1
p = -4, q = 8 (there was more than one question with p and q)
135 degrees anticlockwise

Reply 1263

anonymousGangsta

4

Original post by TH3-FL45H

Anyone remember how many marks the last two parts of 9 were worth?

Think I lost all them marks but got the rest the paper

For the first proof by induction is it alright if I didn't do the step shown in the pic?

Both were 3 marks

Reply 1264

Ben_Clare

1

first question, k was +-1/root2
for the newton raphson, it was 12.468 (I think)
I remember p was -4 and q was 8 in one question.
For the matrix transformation I put 135 degrees anticlockwise
for x co-ordinate of M I got 15root2/4 or 15/2root2
Mod z I got root5, argZ I got 2.03
cant remember any more..

Reply 1265

Person18

4

Does anyone know if there's an unofficial mark scheme? I know my teachers said they can't see it until tomorrow

Reply 1266

aidan4321

1

Original post by veldt127

Very reasonable paper, I would expect standard boundaries

f*** you

Reply 1267

ombtom

17

Original post by LewisClothier

not sure, i think z = -1 + 2i or something, so it was pythag on that for root 1^2 +2^ hence root 5

I also got z = -1 + 2i, so |z| =

\sqrt5

Reply 1268

LewisClothier

6

Original post by TH3-FL45H

Anyone remember how many marks the last two parts of 9 were worth?

Think I lost all them marks but got the rest the paper

For the first proof by induction is it alright if I didn't do the step shown in the pic?

I did the exact same as you on the induction, realised it needed to be -2k -3 to be able to be factorised to (k+1)^2 for it to cancel with the bottom, just didn't write out that step, let's hope that's fine!

Reply 1269

Person18

4

Original post by ombtom

Definitely harder than usual, but not impossible.

Here are a few of my answers that I can remember:

k = +/-\sqrt2/2

12.468
a = 38, b = 15, c = 1
p = -4, q = 8 (there was more than one question with p and q)
135 degrees anticlockwise

Few I got that :smile:

Reply 1270

BinaryJava

16

How did you guys get a number as the midpoint I got 5p-1/2p

Reply 1271

AhnafR

1

How do you prove T is self inverse? Was detT = -1

Reply 1272

Person18

4

Original post by LewisClothier

I did the exact same as you on the induction, realised it needed to be -2k -3 to be able to be factorised to (k+1)^2 for it to cancel with the bottom, just didn't write out that step, let's hope that's fine!

I did that as well! I got so confused as I don't know if you can do that. Hopefully we'll get the marks though

Reply 1273

Chirstos Ioannou

2

Original post by Zonaid Zaki

k=5

How? It's the first time i've seen such a question.

Reply 1274

jonahz123

1

Do we get any marks for error carried forward? (So if we got the wrong value for a but used our value correctly on the questions after)

Reply 1275

TH3-FL45H

19

Original post by Person18

I did that as well! I got so confused as I don't know if you can do that. Hopefully we'll get the marks though

Mathematically it is correct. I just don't know if the examiners want that step that we missed out.

Reply 1276

LewisClothier

6

Original post by ombtom

I also got z = -1 + 2i, so |z| =

\sqrt5

awesome, i just saw someone put 2.03, but it's 2.23, i think they just remembered it wrong

Reply 1277

Sallekmo

2

Original post by TH3-FL45H

Anyone remember how many marks the last two parts of 9 were worth?

Think I lost all them marks but got the rest the paper

For the first proof by induction is it alright if I didn't do the step shown in the pic?

5 marks each, 10 marks all together, got all 10 marks lol but took me ages after my mind was destroyed in the last question