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07-31-2005, 11:24 PM
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#211 | | Member
Join Date: Jun 2005
Threads: 19
Posts: 373
| "Sat Math Question
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Hey guys - wondering if any of you can crack this one.
"If a and b are positive integers and (a^(1/2)*b^(1/3))^6 = 432, then what is the quantity of ab?" - so far i solved it only through looking at the answers and using factors of those answers to plug it back into the first equation to see if it equals 432. Got lucky and got it. Any ideas? Let me know if you guys need the answers."
I believe this question was posted in another thread... ?
How can you use the Ti-89 Titanium to do things like this? | 
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07-31-2005, 11:38 PM
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#212 | | Member
Join Date: Jun 2005
Threads: 27
Posts: 425
| nope...i tried | |
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08-01-2005, 01:47 AM
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#213 | | Junior Member
Join Date: Jul 2005 Location: Ma Maison, Californie Méridionale
Threads: 15
Posts: 244
| Umm, does the answer happen to be 12?
Btw, is this a SAT I question? | |
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08-01-2005, 02:47 AM
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#214 | | Member
Join Date: Jun 2005
Threads: 19
Posts: 373
| "Umm, does the answer happen to be 12?
Btw, is this a SAT I question?"
Yes... The Answer is 12... I believe so.... | |
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08-01-2005, 09:02 AM
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#215 | | New Member
Join Date: Aug 2004
Threads: 3
Posts: 17
| ahhhh thank you very much harvard, havnt even thought about that way. - Been trying to manipulate the exponents, gone into log and stuff. lol nice. Yea i tried searching for it.. to no avail, sorry  | |
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08-01-2005, 10:39 AM
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#216 | | Moderator
Join Date: Jun 2005 Location: Northeast Gender: Not Saying
Threads: 21
Posts: 899
| Re: post 211.
Harvard, unfortunately, you can't use TI-89 for solving this - it does not solve in integers.
Only a small help:
factor(432) gives you
2^4 * 3^3. | |
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08-01-2005, 12:08 PM
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#217 | | Junior Member
Join Date: Jul 2005 Location: Ma Maison, Californie Méridionale
Threads: 15
Posts: 244
| (a^(1/2)*b^(1/3))^6 = 432
a^3*b^2=432
a^3*b^2=3*144
√(a^3)(b^2)=√3*144
ab√a=12√3
a=3, b=4
b can also equal to -4 but in this case ab=12 (a=3, b=4) and I'm guessing that this is a grid-in so there can't be any negative grid-in answers. | |
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08-01-2005, 01:45 PM
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#218 | | Junior Member
Join Date: Jul 2005
Threads: 22
Posts: 221
| Learning vocab is a HUGE waste of time. I studied nothing but vocab words from various SAT books, and it nothing to help my score. Going over grammar with someone who knows it is a great way to raise your writing score; don't bother with vocab. | |
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08-02-2005, 12:46 PM
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#219 | | New Member
Join Date: Aug 2004
Threads: 3
Posts: 17
| Thanks retribution for another great way of looking at it! | |
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08-02-2005, 12:50 PM
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#220 | | New Member
Join Date: Aug 2004
Threads: 3
Posts: 17
| I agree with oddyssy on that matter. When you are not looking to score a near perfect in the sat, you shouldn't worry too much about the vocabulary portion of the cr sections and instead should focus on where your efforts can pay off much quicker. However, if you are looking for near perfection, perhaps a better vocabulary will help boost your score to get ya that last couple of points. | |
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08-04-2005, 07:28 PM
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#221 | | New Member
Join Date: Jul 2005
Threads: 1
Posts: 29
| Oh!I have read some posts & Xingi said that the CB prep book is the best .But how about Barron, Kaplan workbooks.....Are they fine? | |
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08-04-2005, 07:31 PM
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#222 | | Member
Join Date: Jun 2005
Threads: 27
Posts: 425
| nope...they dont have accurate practice tests | |
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08-05-2005, 02:36 PM
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#223 | | Junior Member
Join Date: Aug 2005
Threads: 27
Posts: 242
| NEVER use any other company's tests:
1. They have typos, while the ETS ones are all meticulous
2. Their explanations for their answers sometimes contradict those of ETS, so your thinking process will be skewed, especially for CR
3. Just use past tests from the SAT and SAT II writing. . . | |
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08-06-2005, 04:16 AM
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#224 | | New Member
Join Date: Jul 2005
Threads: 1
Posts: 29
| Really ?But many students in my country use Barron ,Kaplan prep books while there is only one book of CB ( 10real SAT or sth else).? | |
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08-06-2005, 01:35 PM
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#225 | | Junior Member
Join Date: Aug 2005
Threads: 27
Posts: 242
| CollegeBoard has like two huge books. . .which is enough . . i personally would do each book over two or three times to make sure you understand your mistakes and recognize CB's stupid patterns. and memorize a lot of vocab. . .I don't know why Xiggi's against this. . .even if you know all of CB's secret strategies, you're still screwed if you don't know what "sophistry" means. . .(i thought it had something to do with sophisticated, but I was WAY wrong) . . .but I guess that people in Asian countries study a lot of vocab already (I hope that wasn't too bad of a stereotype. . .) | |
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