Polynomial Remainder Theorem: Elementary Proof (DTube)

in #dtube7 years ago (edited)



NOTE: This is a re-upload because the previous video (

) was in AVI format but apparently that doesn't work on DTube so I've re-uploaded in MP4.


In this video I go over a second proof of the Polynomial Remainder Theorem which I derived in my earlier video but this time look at a what is sometimes referred to as a more “elementary” proof. In my earlier video I used the Euclidean Division theorem for Polynomials to show that the remainder of a polynomial f(x) divided by the polynomial (x – a) is simply equal to f(a), and hence is a constant. But in this video I take a look at a more “basic” approach, hence the term “elementary”, in deriving this very same theorem. From my last video I showed that (x – a) is a factor of the polynomial of the form (x^k – a^k). This becomes useful since the subtraction f(x) – f(a) is simply a linear combination of polynomials of that very same form. This means that f(x) – f(a) can be divided cleanly by (x – a) thus resulting in a quotient, q(x). Rearranging the resulting formulation we obtain f(x) = q(x)(x – a) + f(a) where f(a) is our remainder, thus proving the theorem! This is a very unique approach to deriving the polynomial remainder theorem and is always great to learn the many different ways of deriving the same theorem, so make sure to watch this video!

Download the notes in my video: https://1drv.ms/b/s!As32ynv0LoaIh4ItFjOYuitEy7DWoA

View Video Notes on Steemit: https://steemit.com/mathematics/@mes/polynomial-remainder-theorem-elementary-proof

Related Videos:

Polynomial Long Division: (x - a) is a factor of (x^k - a^k) PROOF:


Euclidean Division of Polynomials: Theorem and Proof:

Polynomial Remainder Theorem: Proof + Factor Theorem:

Polynomials - A Simple Explanation:

Polynomial Long Division - In depth Look on why it works!:

Polynomial Long Division - Examples:

Factoring Quadratic Polynomials by Guessing:

Direct Substitution for Polynomials - Simple Proof:

Polynomial Long Division: Multiple Variables:
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I don’t always prove the polynomial remainder theorem but when I do I usually follow up with a more “elementary” derivation ;)

View Video Notes on Steemit: https://steemit.com/mathematics/@mes/polynomial-remainder-theorem-elementary-proof

Thank you!You really helped me understanding :)

Very interesting post.