Edexcel Core 3 - 21st June 2016 AM

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How marks was the question with finding wquation for normal?
I conpletely forogt it was normal and jus did gradient equals 2.
Any idea how many mark it was.

Reply 1601

oShahpo

Original post by Iamvery1/cos(c)

My sister just sat this exam and she realised afterwards that she completely missed out the last question because she didn't see it.

Will this be catastrophic if she wants a high A?

Last question was only 6 marks. 90 UMS is usually about -6/-7 marks so she might even get an A* if she did all else great.

Reply 1602

TSRPAV

Original post by suibster

Gradient is worked out by differentiating:

Y=x^2 + 3 + 4(x-2)^-1
( can't remember what B was but B is irrelevant in this question)

dy/dx = 2x - 4(x-2)^-2

If you differential is right then maybe not many marks is lost.

everything was correct expect my retard brain that say it was 2x-4/(x-2)^2 and decided to plus for some reason

Reply 1603

IYGB

Original post by Iamvery1/cos(c)

My sister just sat this exam and she realised afterwards that she completely missed out the last question because she didn't see it.

Will this be catastrophic if she wants a high A?

I think so

Reply 1604

Anon-

Original post by jshep000

mate are we the same person? exactly what I did, long division, then my remainder cancelled it exactly like that you boss lad

wow what a crazy coincidence!! oh wait that's the only way to do it

Reply 1605

christinasa

Original post by Josh Ironside

how many marks was Q9?

9a 2marks
9b 2marks
9c 4marks

Reply 1606

us3r12345us3r

Original post by hasan6091

G(x)= arc sin x
So 3g(x+1) + pi = 3arc sin x+1 + pi
Arc sin (x+1) = -1/3pi
X = sin (-1/3 pi) -1

if G(x)= arcsin(x) then G(x+1)= arcsin(x) +1 not arcsin(x+1) so 3g(x+1) +pi = 3arcsin(x) +3 +pi

then continue to solve

Reply 1607

Whizbox

Original post by Yua

did you remainder end up like so

4x+12

4(x+3)/(x+3)(x-2)

so 4/x-2

Yeah exactly that

Reply 1608

celecia01

Original post by Sophie Wilczek

Can anybody remember how much was question 1 a) worth?

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5 I think

Reply 1609

splashywill

on the Rcos(theta + a) question i got for the value of a i got tan^-1(a/b) with the a and b the wrong way round... how much will this cost me?

Reply 1610

jshep000

Original post by Anon-

wow what a crazy coincidence!! oh wait that's the only way to do it

Not really there were 2 ways you could have done it you melt, was referring to how we got exact answers earlier on in the thread as we discussed them.

Reply 1611

Josh Ironside

Original post by marethyu

No it won't not worth worrying about it. The last q was worth 8 marks, a high A would be about 65/75 being pessimistic so tell her not to worry. Generally people seem to be classing this as a hard paper so a high A might well be 62/75 :smile:

Guys, let me on it. I missed the last one too. I feel really bad.

Reply 1612

nihaohy

How many marks do 1b , 2b and 6b worth?
For 1b I wrote a=6 and a=-5 but forgot to reject the answer a=-5
For 2b I misread and put -rt5<x<rt5 but managed to work out rt5?

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Reply 1613

83457

For the question with the modulus graph, for y = 0, i wrote 0.5ln(6.25), not noticing 6.25 can be rooted to 2.5. How many marks was that? One I get full marks, or do those questions typically require a simplified answer?

Reply 1614

SomeDancinPanda

How many marks for:

1) The inequality question (answers of sqrt5 and -sqrt5)
2) The question where you had to choose two values and show the change in sign
3) The question where you had to find the minimum value (answer of 80-something)

Would appreciate it if someone could tell me how many marks each of these were worth :smile:

Tough paper in comparison to others, I predict 64 for an a*

Reply 1615

celecia01

What did everyone get for the question involving acosec(by)?
I got 8cosec(4y) but seen some people saying it's (1/2)cosec(4y)

Reply 1616

Mahiali

Guys how many marks was question 6

Reply 1617

Sophie Wilczek

Can anybody remember how much was question 2a) worth

Posted from TSR Mobile

Reply 1618

Piers456

How many marks for Q3C, 6B, 7AB?

Reply 1619

DomWoodcock

Few questions:

5ai - how many marks would one get for getting the turning point at 0.1608 rather than 0.9643,

6b how many marks would i get for finding the equation of normal for the simplified equation. I differentiated y= x^2 + 3 + (4x+12)/(x-2) and did the normal steps, I know the divison was wrong as forgot (x+3) on denominater. (Since part B was solely dependent on part A surely there would be marks for method)

8b I thought it was within the range -pi/2 and +pi/2 so only had 2 solutions within the limits, how many marks would i get/lose for this?

thanks