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# Official C3 Exam Discussion WJEC - 24/05/13 watch

1. This was most of my answers for C3. The may or may not be correct. Would like feedback if anyone else had similar answers. Also, have missed out a few. Didn't have enough time to write them down at the end.

1) Simpson Rule, a) 5.328 b)Didn't understand :/
2) Theta, a) 41.81, 138.19, 194.48, 345.52 b) 210, 330
3) Curve, a) [-3x(Sqaured).y(Squared)] / [x(cubed).2y] b) ii) a=2, b=-4
4) In Terms T, a) 20t(Power 4) b) t=0.3

7) Inequality, b) 2>x<4
8) Alpha = -1.67723
9) Graph was flipped, with co-ordinates (-5,0), (-1,4), (3,0)
10) a) f-1(x) = -2(ln(x-6)-5) b) [7, infinite)
11) a) i) Domain (0, (Pi/4)] b) i) x= 33.84

So, that was some of my answers. Anyone else get similar answers?
2. hi, for question 1 i had 5. soemthing and for the second part i had 2.644 and for 2b) i did sine (thi) -0.5 and got 210 and 330 for 3b i partly showed b=-2a i defo got the values of a and b wrong (probs one mark for working out). For 4b i got t=0.3, 6b i got 1.444 or 13/9 for 7b- <= 4 and >=2
3. i got everything , except the value of a andb and for x its actually 33.82
4. (Original post by GeorgeLow)
This was most of my answers for C3. The may or may not be correct. Would like feedback if anyone else had similar answers. Also, have missed out a few. Didn't have enough time to write them down at the end.

1) Simpson Rule, a) 5.328 b)Didn't understand :/
2) Theta, a) 41.81, 138.19, 194.48, 345.52 b) 210, 330
3) Curve, a) [-3x(Sqaured).y(Squared)] / [x(cubed).2y] b) ii) a=2, b=-4
4) In Terms T, a) 20t(Power 4) b) t=0.3

7) Inequality, b) 2>x<4
8) Alpha = -1.67723
9) Graph was flipped, with co-ordinates (-5,0), (-1,4), (3,0)
10) a) f-1(x) = -2(ln(x-6)-5) b) [7, infinite)
11) a) i) Domain (0, (Pi/4)] b) i) x= 33.84

So, that was some of my answers. Anyone else get similar answers?

1)b) was log.rule

5. (Original post by Tania2k9)
i got everything , except the value of a andb and for x its actually 33.82
I'm assuming that fg(x) = -0.4 on the scan (it's a bit blurry)? If so, then it's 33.83 (2dp) as the calculator gives 33.83473935...
6. (Original post by Tullia)
I'm assuming that fg(x) = -0.4 on the scan (it's a bit blurry)? If so, then it's 33.83 (2dp) as the calculator gives 33.83473935...
Yeah, I got that. I also gave an answer in radians on the side to 2 dp. Is that okay?
7. i hope 33.82 is right, on the calculator do e-0.4 then to shift tan of that answer and you get 33.822085
9. I did it in rads as the domain was in terms of pi.

overall a nice paper. Can't see where I've lost the marks yet. Probably the functions knowing me.
10. Phewww haha I did my f-1(x) on Q10 as

-2ln(x-6)+10. ?? Is that right bc I just expanded the brackets out :/
11. (Original post by L'Evil Fish)
Yeah, I got that. I also gave an answer in radians on the side to 2 dp. Is that okay?
I would've given it in rads for the reason given above, but I don't think they'll mark you down for having put them both to two decimal places. I expect they'll accept the answer in only degrees as well, but don't take my word as gospel on that.
12. (Original post by Lizard cream)
I did it in rads as the domain was in terms of pi.

overall a nice paper. Can't see where I've lost the marks yet. Probably the functions knowing me.
I agree! Definitely functions
13. (Original post by priteshp)
Phewww haha I did my f-1(x) on Q10 as

-2ln(x-6)+10. ?? Is that right bc I just expanded the brackets out :/
That'll be fine. Although, I would have wrote it the other way around as it looks easier on the eye.
14. What did ppl have for the fg(x) range??? I got 0,-infinity
15. (Original post by priteshp)
What did ppl have for the fg(x) range??? I got 0,-infinity
That's incorrect, I'm afraid.
17. Tricky exam in places, on 7b I lost some marks, I spaced and didn't combine the intervals, should have got something like -4<=x<=-2 or 2<=x<=4 I think.
Also, for question 4b does it ask for t or for x, I can't remember, I only solved for t so I was wondering if you then have to substitute to find x or was it finished at t?

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