OCR (not MEI) C1 - Wednesday 13th May 2015

Basically
I used the actual booklet to do the majority of my working and answers and I used the continuation booklet to redo/check some of my answers to absolutely make sure I didn't make a mistake. I used the continuation booklet to actually answer q8 part i as I messed up the graph the first time round. I did put 'check' in brackets beside each question I was checking and starred question 8 to say I was actually reattempting it. Now, someone is telling me that it is 'risky' I redid/checked my answers in this booklet and that the two sets of working may not be credited as it 'doesn't match'. Is this true? I would've thought the examiner would realize I was checking my answers as I circled/underlined most of my actual answers in the original booklet...
Would appreciate it if someone could get back to me on this

It would all depend on your quality written communication. If you made it easy for the examiner to see then you could possible be okay.

Hi - quick question, I'm trying to solve this disguised quadratic (that came up in a C2 paper?!) but I'm having trouble matching the answer. So here's the quadratic that I've been given:

Find the value of k
15 = k + 2k^1/2
where k is a constant in y = 4k^x such that k > 1

My solution so far:

let k^1/2 = x

15 = x² + 2x
x² + 2x - 15 = 0
(x+5)(x-3) = 0

∴ x = -5 or 3
∴ k = (-5)² or 3²

k= 25 or 9

However the question says give the value of k, so only one of these two solutions is correct. I know which one from looking at the MS, but can someone explain why both are not valid? They are both > 0, so I don't get it

Hi - quick question, I'm trying to solve this disguised quadratic (that came up in a C2 paper?!) but I'm having trouble matching the answer. So here's the quadratic that I've been given:

Find the value of k
15 = k + 2k^1/2
where k is a constant in y = 4k^x such that k > 1

My solution so far:

let k^1/2 = x

15 = x² + 2x
x² + 2x - 15 = 0
(x+5)(x-3) = 0

∴ x = -5 or 3
∴ k = (-5)² or 3²

k= 25 or 9

However the question says give the value of k, so only one of these two solutions is correct. I know which one from looking at the MS, but can someone explain why both are not valid? They are both > 0, so I don't get it

Can anyone remember 3iii? I can't remember the question or what I put as my answer so if someone could remember the question I can work out what I put XD thankyouu 😊

thnx so does that mean ill get 2 or 3 marks

We had 3 months to learn all of fp1, so we resorted to 1 chapter a day (last year). At first I hated it but after a while when I FINALLY started to understand it, it became so interesting and i'd go as far as to say that it's the most interesting maths i've ever done and it really did fuel my interest for it further. Kind of took me back to gcse days when maths was so easy and fun and all I wanted to do...

And then I got a D in the fp1 exam cos the exam was balls up. Everyone else got Us and an E in my school.

Hey all! What would 71/72 get me UMS wise do you think? I'm slightly concerned that I wrote 1/48 instead of -1/48 for a question. I might not have done but I don't remember. Overall I thought is was a pretty simple paper though

Yup exactly that, it's such a nice easy calculator to use. Had it since year 5 as well so it's trusted now . I'm really hoping for a matrices induction Q and easy roots stuff. They'll make or break how well I do really. Btw June 09 had 49 as the A boundary but it really wasn't that challenging... Very strange



100% agree, there's a satisfaction about getting a summing series question right or an induction question right, especially if it's a nice and long 7 marker.

Take it in! Honestly no one is going to say a thing, I know someone who's walking in with a huge graphic calculator that has a home screen... It's basically a computer. They are definitely allowed. The only thing that's not allowed is if it can do indefinite integration but that doesn't even apply to FP1 so you're fine

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Hey all! What would 71/72 get me UMS wise do you think? I'm slightly concerned that I wrote 1/48 instead of -1/48 for a question. I might not have done but I don't remember. Overall I thought is was a pretty simple paper though