Dividing Polynomials

Notes:

Terms

P(x): Polynomial function.

D(x): - The Divider (What you used to divide the polynomial function). “D is for Divider”.

R(x): - The Reminder (Quantity that is left over after the division operation).


Other Things To Remember:

  • The two ways to write a Deperessed Polynomial :

    *P(x) = D(x)*Q(x)+R(x)*

    OR

    P(x)/D(x) = Q(x) + R(x)/D(x)


Ways to divide Polynomials

  1. Long division

OR

  1. Synthetic division

Theorems

The Remainder Theorem:

If a polynomial P(x) is divided by (x-c), then the remainder ® is P©.

Proof:

P(x) = Q(x)(x-c) + r
P(c) = Q(c)(c-c) + r
P(c) = Q(c)(0) + r
P(c) = r

We can essentially rewrite P(x) = Q(x)(x-c) + r to P(x) = Q(x)(x-c) + P(c)

The Factor Theorem:

If P(x) is a polynomial and P© = 0; Then (x-c) is a factor of P(x). - That is… P(x) = Q(x)(x-c)