x Turn on thread page Beta
 You are Here: Home >< Maths

1. I was doing a Core 3 Past Paper (AQA, June 2014) but wasn't entirely sure about how many marks I would get for some questions:

On question 2)a, it says dy/dx = -2 x (1/(2e-x))

I put dy/dx = -2 / 2e-x. Is this full marks?

Likewise for question 3)a:

The markscheme says 5/2 x 2x(x^2+1)^3/2

I put 5x(x^2+1)^3/2

For 3)b, the question says to find the x coordinates of the stationary points. I found them correctly, but I also found the y coordinates. Do I drop a mark for this?

For question 4)c)i, the markscheme says the stretch is scale factor 1/2 // x axis

Is stretch, scale factor 1/2 in the x direction the right thing?

For 6)a, the markscheme puts the constant of integration as a capital C

I put mine as a lower case c. Do I drop the final mark?

2. (Original post by MathsALevel123)
I was doing a Core 3 Past Paper (AQA, June 2014) but wasn't entirely sure about how many marks I would get for some questions:

On question 2)a, it says dy/dx = -2 x (1/(2e-x))

I put dy/dx = -2 / 2e-x. Is this full marks?
Assuming the -2 x (...) is multiplication, you would get full marks.

(Original post by MathsALevel123)
Likewise for question 3)a:

The markscheme says 5/2 x 2x(x^2+1)^3/2

I put 5x(x^2+1)^3/2
Assuming 5/2 x 2 x (x^2+1)^(3/2) (bolded is multiplication) then yes, full marks.[/quote]
(Original post by MathsALevel123)
For 3)b, the question says to find the x coordinates of the stationary points. I found them correctly, but I also found the y coordinates. Do I drop a mark for this?
No. Full marks.

(Original post by MathsALevel123)
For question 4)c)i, the markscheme says the stretch is scale factor 1/2 // x axis

Is stretch, scale factor 1/2 in the x direction the right thing?
You may lose a mark here, x direction is a bit ambigous, I would stick with stretch parallel to the x axis, that's what the // means parallel.

(Original post by MathsALevel123)

For 6)a, the markscheme puts the constant of integration as a capital C

I put mine as a lower case c. Do I drop the final mark?
No.
3. (Original post by Zacken)
Assuming the -2 x (...) is multiplication, you would get full marks.

Assuming 5/2 x 2 x (x^2+1)^(3/2) (bolded is multiplication) then yes, full marks.
It is 5/2 times 2x (x^2+1)^3/2 and I put 5x(x^2+1)^3/2

No. Full marks.

You may lose a mark here, x direction is a bit ambigous, I would stick with stretch parallel to the x axis, that's what the // means parallel.

Oh. I always used to do parallel to the x axis but then I changed it for some reason...

What's the difference between the 2?

No.[/QUOTE]
4. (Original post by MathsALevel123)
It is 5/2 times 2x (x^2+1)^3/2 and I put 5x(x^2+1)^3/2

No. Full marks.

You may lose a mark here, x direction is a bit ambigous, I would stick with stretch parallel to the x axis, that's what the // means parallel.

Oh. I always used to do parallel to the x axis but then I changed it for some reason...

What's the difference between the 2?

No.
[/QUOTE]

Well, you could mean a stretch perpendicular to the x-axis, you need to state that it's parallel.

Also, yes, your 5/2 thing is correct.
5. Well, you could mean a stretch perpendicular to the x-axis, you need to state that it's parallel.

Also, yes, your 5/2 thing is correct.[/QUOTE]

Ok. Thanks for all your help

TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Updated: November 8, 2015
Today on TSR

### Did he block me?

What should I do?

### Can you do this at Oxford?

Poll
Useful resources

Can you help? Study help unanswered threadsStudy Help rules and posting guidelinesLaTex guide for writing equations on TSR

## Groups associated with this forum:

View associated groups

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE