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Hi, now I am learning a new topic in Math called "Monomials". Although I already learned a bit of ranks and terms ["r" and "t", for example] but we have just started a new topic and I do not completely understand.

- What monomial represents the rule for the following sequence?

- 2, 8, 18, 32, 50, 72

- So I did the following calculations:

- 72-50=22

- 50-32=18

- 32-18=14

- 18-8=10

- 8-2=6

- So what I noticed was that the differences between each "difference" was increasing/decreasing [depending on the order that you look at it], by four.

- 22-18=4

- 18-14=4

- 14-10=4

- 10-6=4

- So again, I will repeat the question "What monomial represents the rule of that following sequence?"

- Thanks

Hi. Before discussing monomials a little bit, I'll cut to the chase. If you divide the sequence by 2 you get the new sequence

Snew = 1, 4, 9, 16, 25, 36

which can be recognized as a sequence of perfect squares, so that

Snew = 2n^2 for n = 1 to 6.

A monomial, as I assume you know, is defined as a term in a multi-variate polynomial and looks like

(x1^e1)(x2^e2) ... (xn^en)

where n is the number of variables and the sum of the exponents is d = e1 + e2 + ... en. The monomial above has 1 variable, n, and is of degree 2. The sequence is generated by increasing n (an integer).

I was mystified for a while because the sequence associated with a monomial is usually defined as the number of terms which have n variables and is of degree d for d = 0, 1, 2, ... An expression for this involves the binomial coefficient formula (and it doesn't fit this problem, i.e., can't get the given sequence by specifying any combination n and d).

I'm curious what the definitions of the various quantities in your question are. Also, what level are you (grade, year in college)?

Randy

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