# Math:Polynomial Functions

h(x) = -7x

I was thinking that this was not a polynomial function because -7x is just one term making it a monomial but the answer key says it is a polynomial function. Could someone explain why that is so? Thanks :D

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1. You have a point, but the definitions are that
a monomial has only one term,
a binomial has exactly two terms,
a trinomial has exactly three terms, and
a polynomial has at least one term.

Ususally polynomial is used when the number of terms is numerous, unknown or indefinite. It would be too restrictive if 1-3 terms are excluded from the definition.

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2. why would something like y=x^-3 not be a polynomial function?

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3. must the value of n always be nonnegetive?

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4. Yes, the exponents have to be non-negative (i.e. zero allowed, thus constant terms) and integers. x2/3 and x-2 are not polynomials.
The definition of a polynomial, as per Wiki, is as follows:

"In mathematics, a polynomial is a finite length expression constructed from variables (also known as indeterminates) and constants, by using the operations of addition, subtraction, multiplication, and constant non-negative whole number exponents."

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5. and for something like
y=cosx

that dosent work cause cos is not a real number?

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6. That works, but as a trigonometric function and not a polynomial function. I the definition of a polynomial function, the right hand side must be a polynomial, as defined above.

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7. Thank you :D

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8. You're welcomd!

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