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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)?


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randy patton


college mathematics, applied math, advanced calculus, complex analysis, linear and abstract algebra, probability theory, signal processing, undergraduate physics, physical oceanography


26 years as a professional scientist conducting academic quality research on mostly classified projects involving math/physics modeling and simulation, data analysis and signal processing, instrument development; often ocean related

J. Physical Oceanography, 1984 "A Numerical Model for Low-Frequency Equatorial Dynamics", with M. Cane

M.S. MIT Physical Oceanography, B.S. UC Berkeley Applied Math

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