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Pre college algebra 

09212012, 3:03 PM

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Pre college algebra
Who knows how to write out and use recursive equations. Thbats the uniot we are in right now and I dont understand. Ex. 10,5,0,1
Wright a recursion formula for this system of numbers?
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09212012, 6:21 PM

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09212012, 10:09 PM

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Don't worry about it. You'll never use it again.
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09212012, 10:18 PM

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Quote:
Originally Posted by Leffler817

Or you will use it again and again and again lol



09232012, 7:41 PM

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Quote:
Originally Posted by fishman13
Who knows how to write out and use recursive equations. Thbats the uniot we are in right now and I dont understand. Ex. 10,5,0,1
Wright a recursion formula for this system of numbers?

Is that really the sequence of numbers you were given, or should it be 10, 5, 0, 5?
If those really were the right numbers, what did the answer turn out to be?



09242012, 6:48 AM

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It was just an example. But yeah it should of been 5. Thanks guys
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09242012, 6:58 AM

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I'm a little late responding, but by now hopefully you learned that you have to figure out the pattern in the numbers, then come up with a formula for the next number in the sequence, based on the prior number. So, for this one, you subtract 5 from the previous number in the sequence. You know that "n" means the nth number in the sequence, so the (n1)th number is the immediately preceding number?
Formula for your example is Tn = T(n1) 5
The n and (n1) above should be subscript, but I can't do that in this editor.






10022012, 4:44 PM

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I can't figure out the answer for the nth term in the sequence given above  if the T(n) I am looking for is the 20th term in this sequence the formula given requires me to know what the 19th number in the sequence is before I can figure out the 20th term. In general, the nth term of an arithmetic sequence is given by the formula
a(n) = a(1) + (n1)d where n is the nth term you are looking for and a(1) is the first term in the sequence and d is the difference between the numbers in the given sequence. So for 10,5,0,5 the first number in the sequence a(1) is 10, you are looking for the next number in the squence which in this case is the 5th number so (n1) is 4 and the d = 5 so [10  4*(5)] is 10  20 = 10. This formula works for geometric and arithmetic sequences but Cameron was asked to write a recursive formula for this sequence and this formulation is not a recursive formula. It will give you the nth term in a simple geometric progression but would not for example provide the answer he is looking for when the difference is not a simple integer.
This is College Algebra (not arithmetic) and "recursive" formulations require calculating the smaller differences in numbers in a sequence and using the difference between them in such a manner as to build the summation series for enough of the first elements to be able to calculate future differences  a really good example (of how to calculate a Fibonacci Series) for those who are interested (and hopefully Cameron is) can be found at the following link  http://www.cs.uiuc.edu/~mfleck/build...definition.pdf




10032012, 10:37 AM

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Quote:
Originally Posted by Leffler817

PRICELESS from our school teacher.



10042012, 10:39 PM

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PRICELESS from our school teacher.

Hey! I like to keep it real! I don't remember the last time I needed Trigonometry or Calculus but I was forced to take it in school.



10042012, 10:55 PM

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WTF!!! If I have 12 donuts, and I eat one, I have 11 left! What more do I need to know?!?! I was a math/science major in high school and college. I have NEVER needed to use algebra or calculus EVER since! And I still have 11 donuts! What I have learned thru this long, but tenuous life we all lead, is that I have donuts to share with all sentient beings(although they're starting to 'firm up'!) Amen



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