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05-09-2008, 03:42 AM
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#1 | | New Member
Join Date: Dec 2005
Threads: 7
Posts: 28
| Official 2008 Calculus BC FRQ Discussion
hey guys!
it has been 48 hrs. collegeboard has posted the frq questions here http://apcentral.collegeboard.com/ap...lus_bc_frq.pdf ...let the discussions begin?
first of all? wut did ppl put for 1d? | 
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05-09-2008, 04:14 AM
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#2 | | Senior Member
Join Date: Jan 2007 Location: LI, NY -> Brown Gender: Male
Threads: 74
Posts: 1,056
| for 1d, I did:
the INTERGRAL from ZERO to TWO of ((sin(pi x) - (x^3) + 4x) * (3-x)), dx
I don't have my calculator, but was the answer something around 9.something? | |
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05-09-2008, 04:37 AM
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#3 | | Junior Member
Join Date: Apr 2006
Threads: 12
Posts: 39
| #2c you guys get 2?
#4(a) - t = 3 because thats the time when the particle stops and reverses direction; the area under the curve is greatest here
#4(b) - 1 value of t; the total area under the curve equals -8 only once, and that is when t = 3; the object goes to x = -8 when t = 3, goes to x = -5 when t = 5, and gets to x = -7 when t = 6
#4(c) - speed is decreasing because the velocity is approaching zero
#4(d) - [0,1) and (4,6] - the velocity of the particle begins to slope downwards, implying negative acceleration
#4 was the ONLY ONE THAT I DID GOOD ON LMFAO i sucked at everything else
and for the very last one, 5(c), i used the Stand and Deliver tic tac toe method, not the uv-vdu method. Do the readers not award points if I do this?
Last edited by ftc123 : 05-09-2008 at 04:50 AM.
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05-09-2008, 05:42 AM
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#4 | | Junior Member
Join Date: Dec 2007
Threads: 27
Posts: 152
| tag thread  ! | |
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05-09-2008, 06:42 AM
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#5 | | Senior Member
Join Date: Jan 2007 Location: P-Town, where the ballas Ball
Threads: 75
Posts: 4,234
| ftc123...wow i got different answers than you (i think..maybe i just dont understand what you're writing)...ISHT! | |
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05-09-2008, 06:43 AM
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#6 | | Member
Join Date: May 2005
Threads: 77
Posts: 697
| 4(b) is 3 Remember initial condition is -2 so at three it is at -10.
2(c) is also three. Draw a graph
Others are right. | |
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05-09-2008, 06:48 AM
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#7 | | Senior Member
Join Date: Jan 2007 Location: P-Town, where the ballas Ball
Threads: 75
Posts: 4,234
| I got the same answers as stix 
I think I *might* have gotten 4c wrong for some reason..dont remember what i put... | |
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05-09-2008, 06:50 AM
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#8 | | Member
Join Date: May 2005
Threads: 77
Posts: 697
| 1(a). 4
b. expression
c. 9.987 (or something like that)
d. 8. something
2.8 people per hour
b.155.25 (ish)
c.3
d.973
3.62.7 ish Less than
b.62.9 ish
c. 2.703 or whatever *10^(-4)
4.t=3 and position -10
b. 3
c. decreasing
d. (0,1) (4,6)
5.minimum
b. (2,3)
c. 7+3e-e^3
6.graph
b.105/16
c. 7.25
d. (6,8]
Some Rounding issues but whatever | |
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05-09-2008, 07:37 AM
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#9 | | Junior Member
Join Date: Apr 2006
Threads: 12
Posts: 39
| yeah stix is right  that blows there goes my frq | |
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05-09-2008, 10:02 AM
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#10 | | Member
Join Date: Mar 2008 Location: Arizona Gender: Male
Threads: 4
Posts: 335
| Argh I only put one for 2(c) :/
I thought that for 5(b) there was no interval where f''(x) > 0 and where f'(x) < 0? | |
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05-09-2008, 10:38 AM
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#11 | | Junior Member
Join Date: Dec 2007 Gender: Male
Threads: 2
Posts: 294
| Ahhhhhhhh nooooo I don't want to remember that exam! | |
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05-09-2008, 10:39 AM
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#12 | | Junior Member
Join Date: Feb 2008
Threads: 17
Posts: 109
| I got (2,3) for 5b as well, so I'm pretty sure it's right. | |
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05-09-2008, 10:41 AM
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#13 | | Junior Member
Join Date: Sep 2006
Threads: 3
Posts: 97
| Lol, I completely BS'd 3c and got it right (according to stix's answers).
I recognize a lot of those answers, so.. yay! ^_^ | |
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05-09-2008, 10:47 AM
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#14 | | Member
Join Date: Mar 2008 Location: Arizona Gender: Male
Threads: 4
Posts: 335
| sigh, there goes my chances for a 5. Now I'll have to retake if I want credit :'( | |
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05-09-2008, 10:50 AM
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#15 | | Junior Member
Join Date: Sep 2006
Threads: 3
Posts: 97
| Yeah, just retake it next year. I took AB as a class and studied the BC material every night or so in the 2-3 weeks before the exam, and I'm very confident that I got a 5. I also did the 2003, 2000, 1998, 1997, and 2008 audit BC multiple choice in addition to maybe 25-30 free response questions. After doing all of that there was very little I hadn't actually seen, so the test was a breeze. | |
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