What Determines the Degree and Coefficients of Polynomials?

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Discussion Overview

The discussion revolves around the determination of the degree and coefficients of polynomials, specifically addressing constants such as 4 and 0. Participants explore definitions, properties, and classifications of polynomials, including the distinction between monomials and other forms.

Discussion Character

  • Conceptual clarification, Technical explanation, Debate/contested

Main Points Raised

  • Some participants assert that the degree of a constant is always 0, and that any constant can be expressed as cx^0.
  • Others argue that the degree of 0 is technically undefined, as it has no nonzero terms and therefore lacks a degree.
  • There is a discussion about whether both 4 and 0 qualify as polynomials, with some participants confirming they are indeed polynomials since they do not violate polynomial rules.
  • One participant questions the division of variables, specifically whether x/2 is considered a polynomial, leading to clarification that dividing a variable by a constant is permissible, but dividing by a variable is not.
  • Clarifications are made regarding the definitions of monomials and the conditions under which expressions are classified as polynomials.

Areas of Agreement / Disagreement

Participants generally agree on the classification of constants as polynomials and the definition of degree for nonzero constants. However, there is disagreement regarding the degree of 0, with some asserting it is undefined while others maintain it is a polynomial with degree 0.

Contextual Notes

There are unresolved aspects regarding the definitions of polynomial degrees and the implications of dividing by variables versus constants, which may depend on specific mathematical conventions.

mathdad
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Specify the degree and the (nonzero) coefficients of each polynomial.

(A) 4

(B) 0

Solution:

The number 4 can be expressed as 4x^0. Is this correct?
If this is right, then the nonzero coefficient must be 4 itself. Is this right? The degree is 0.

The whole number 0 can be expressed as 0x^0. The degree is 0. What is the nonzero coefficient of 0?

Why is 4 a polynomial?

Why is 0 a polynomial?
 
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(A) The degree of a constant is always 0. Any constant c can be written as cx^0.
(B) The degree of 0 is technically undefined. This is a polynomial but has no nonzero terms (obviously) and therefore has no degree.

These are certainly polynomials! More specifically, monomials, meaning they only have one term. A polynomial is a collection of constants and variables with exponents, but you cannot divide by a variable. Both 4 and 0 are then polynomials, because they do not break this rule.
 
joypav said:
(A) The degree of a constant is always 0. Any constant c can be written as cx^0.
(B) The degree of 0 is technically undefined. This is a polynomial but has no nonzero terms (obviously) and therefore has no degree.

These are certainly polynomials! More specifically, monomials, meaning they only have one term. A polynomial is a collection of constants and variables with exponents, but you cannot divide by a variable. Both 4 and 0 are then polynomials, because they do not break this rule.

You said that we cannot divide a variable. Say, for example, x. Is x/2 not considered x divided by 2?
 
RTCNTC said:
You said that we cannot divide a variable. Say, for example, x. Is x/2 not considered x divided by 2?

Not quite, if I understand what you're asking.

x/2 would be a polynomial. In this case, x is in the numerator. You CAN divide a variable by a constant. That is not an issue.

What I meant was, you CANNOT divide by a variable. Meaning, 2/x would not be a monomial. In this case, you have a variable in the denominator.
 
joypav said:
Not quite, if I understand what you're asking.

x/2 would be a polynomial. In this case, x is in the numerator. You CAN divide a variable by a constant. That is not an issue.

What I meant was, you CANNOT divide by a variable. Meaning, 2/x would not be a monomial. In this case, you have a variable in the denominator.

I get it now.
 

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