wjec c1 maths 13th may

Original post by Mr rump

On the writing booklet it says to rule a line after each question, I forgot to do this? Will this matter?

I don't think anyone does that XD

Reply 222

Original post by andyt345

can someone help me?

For question 7b I did everything right apart from plugging my y values back in to find x values. How many marks will I get?

Also, for the inequalities I used quadratic formula
I divided the 6 by 2 but not the 4 root 2. I did the graph and everything. Any idea how many marks i'll lose?

7b was differentiation if I recall correctly?
Probably just lose one mark. And using the quadratic formula is fine.

Reply 223

VeepFan

how many marks do you think will be lost for not finding the negative value in 4)b)

Reply 224

Original post by VeepFan

how many marks do you think will be lost for not finding the negative value in 4)b)

Again probably one. Shouldn't you have been used to taking both the positive and negative square roots by now?

Reply 225

VeepFan

Original post by PrimeLime

Again probably one. Shouldn't you have been used to taking both the positive and negative square roots by now?

yeah i just forgot about it, i only really figured out what to do at all with 5 mins left

Reply 226

VeepFan

what about not finding L at the end, only finding X and minimum?

Reply 227

Original post by VeepFan

what about not finding L at the end, only finding X and minimum?

Just one mark. It's very easy to forget to do that so I'm sure a lot of people did what you did as well!

Reply 228

Original post by VeepFan

what about not finding L at the end, only finding X and minimum?

Just one mark. It's very easy to forget to do that so I'm sure a lot of people did what you did as well!

Reply 229

junyjunaid500

Original post by ihateexam

anyone knows the correct answer?

answer was 0.5 i got it solved by my teacher and some other teachers too.pretty sure

Reply 230

BDGarson13

I got the same. How did you prove that it was a minimum? I took the second derivative and it gave a positive value which gave me a minimum... I think?

Reply 231

DanElwyn98

Posted from TSR Mobile

I got the equation for x, but didn't have the time to factorise it to 80m/40m... I've just figured it out now using the formula, I'm so pissed at myself haha oh well what can you do

Reply 232

TeeEm

19

Original post by DanElwyn98

Posted from TSR Mobile

I got the equation for x, but didn't have the time to factorise it to 80m/40m... I've just figured it out now using the formula, I'm so pissed at myself haha oh well what can you do

look at the nearest object to you
Grab it and take a bite out of it!
Quite normal...

Reply 233

DanElwyn98

A knife? I don't think so haha

Posted from TSR Mobile

Reply 234

Firestartc

For the last question, i got x = 4, i differentiated correctly but when i got to x^2=1600, i wrote x = 4 for some reason. Hence, how many marks would i lose? I showed when x = 4, there's a minimum (i.e. d^2L/dx^2 >0). So i got the value L wrong and x wrong... And how many marks was the last part of the last question worth? fmlfmlfmlfmflmflfmlfmlfmlfmflmflmflfml, according to the last part of the may 2013 c1 paper, i should lose only 2 marks?

(edited 8 years ago)

Reply 235

Original post by Firestartc

For the last question, i got x = 4, i differentiated correctly but when i got to x^2=1600, i wrote x = 4 for some reason. Hence, how many marks would i lose? I showed when x = 4, there's a minimum (i.e. d^2L/dx^2 >0). So i got the value L wrong and x wrong... And how many marks was the last part of the last question worth? fmlfmlfmlfmflmflfmlfmlfmlfmflmflmflfml, according to the last part of the may 2013 c1 paper, i should lose only 2 marks?

ECF so if you're very lucky one mark but probably two.

Reply 236

Firestartc

Original post by PrimeLime

ECF so if you're very lucky one mark but probably two.

Do you remember how many marks the last part was worth?

(edited 8 years ago)

Reply 237

Original post by BDGarson13

I got the same. How did you prove that it was a minimum? I took the second derivative and it gave a positive value which gave me a minimum... I think?

Yep that's how you do it. :smile:

Reply 238

Mr rump

5

Original post by BDGarson13

I got the same. How did you prove that it was a minimum? I took the second derivative and it gave a positive value which gave me a minimum... I think?

That's what I did, I didn't show it as 1/20 though, I just said if you put 40 into the equation you get a positive value so therefore it's a minimum. Will I still get full marks?

Reply 239