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Edexcel Core 3 - 21st June 2016 AM

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Reply 1400

Pablo Picasso

Original post by QueenOfNachos

Any predictions for 100 UMS?

Reply 1401

Dieselblue

Guys what did you do for 5i? You differentiated to get something like 3cos4x - 4Sin4x. I then put that into RCos(4x+c) format and got a value of x = 0.16...
Couldn't any other way of doing it

Reply 1402

lfcrules

Original post by Whizbox

They're exactly the same, ln2.5 is the simplified version

Do you think full marks will still be given to 0.5 ln 6.75?

Reply 1403

k.russell

The turning point had to be between pi/4 and pi/2 so the answer was 0.9 something
Wasn't the range -pi/4 to pi/2?
That's what I remember it as actually so maybe me and @thehollowcrown are right :smile:

Reply 1404

wr123

Original post by lozzie97

i completed the square but quadratic formula would work too.

get in sonnn i was so worried about that

Reply 1405

Serine Soul

Original post by AhnafR

Guys for 4a) i wrote x=1/2ln(25/4) instead of ln5/2. Did it say to simplify and how many marks would i lose?

I don't think I said to simplify

I hope it didn't anyway :colondollar:

Reply 1406

khaleesi98

Original post by Ecomaths

Why don't we?

Because the grade boundaries won't have been decided yet, as they're based on how well people perform. And if we've all done really badly then they'll be a lot lower than normal anyway.

This idea that maths exams are 'unfair' is really irritating me tbh. I've f-ed up multiple exams this year, so I get that it's frustrating, but it we can't blame Edexcel for the fact that we can't do every single question. Most people can't, that's kinda the point.

Reply 1407

кяя

WHAT THE **** WAS THAT

Posted from TSR Mobile

Reply 1408

nichola_vo

Original post by mpwb12345

Will send u it

Is it possible for you to send me a copy too? Please

Reply 1409

BushDiddit

Original post by SaxyBeast98

How many marks was question 1?

Posted from TSR Mobile

7 (seven)

Reply 1410

squirble

What was question one as i didn't get -5 and 6 as the answer, i did work this out in part b though. how many marks would i lose as would be under part b workings not part a?

Reply 1411

wr123

Original post by lfcrules

Do you think full marks will still be given to 0.5 ln 6.75?

hope so.. I got this too

Reply 1412

TheDonhasRisen

that exam was easy. For the cotx question, I changed the equation in terms of tan2x=2/3. Then worked out the four values of x.

Reply 1413

legolas_09

Guys for the last question if I left a as 1/0.2 would I still get the mark?

Reply 1414

SirRaza97

I didnt know 4sin4x was the same as 2sin2ycos2y. I thought it only worked for Sin2A only. Overall it was decent. A bit harder

Reply 1415

Dentist16

Original post by k.russell

I am pretty sure I got this as well (my answer was deffo smaller than the one that other people are quoting). Wasn't this the question with Tan4x = 4/3 or something like that?

Yeah that was one of the 4 solutions but then when you looked at the boundaries which I think were pi/2<pi/4 0.9463 was the only one which fit

Reply 1416

Daniaal

Original post by Reda2

I thought I could do all questions but I didn't!! Exams are simply not for me...

For my minimum grade predictions I need now A in C4 for overall B, or for my maximum marks I got, I will need overall B in C4 for overall B.

My days, pissed me off. How did you FLIPPIN do the question after you proved cotx? I just could not simplify it!

use the cot^2 +1 = cosec^2 identity

Reply 1417

beast709

Original post by blahblah21

Not too sure its one of the 2, because I remember seeing 32 and 3, so I think 1 of us just read the signs wrong, worst case one of us will lose 2 marks

I got 29/2 at first when I incorrectly used 0.5 as gradient. Using -0.5 gave me 35/2

Reply 1418

GabrielSmith1998

Original post by User57

What did anyone get for 1.a) ??

x=-5 and x=6 ?

a = 6 ?

Reply 1419

rk_

Original post by pineneedles

You were probably putting the numbers in the wrong equation, you had to put them in g(x) = 2x +7 (can't remember what it was), not g(x). I was getting so angry at that question then I realised XD

Posted from TSR Mobile

trust I put it into every equation available on that page but still didn't get that 1 mark. (1 mark for the interval??)