# How do you factor a polynomial theorem?

## How do you factor a polynomial theorem?

How To: Given a factor and a third-degree polynomial, use the Factor Theorem to factor the polynomial.

- Use synthetic division to divide the polynomial by (x−k).
- Confirm that the remainder is 0.
- Write the polynomial as the product of (x−k) and the quadratic quotient.
- If possible, factor the quadratic.

## What is factor theorem explain with example?

Answer: An example of factor theorem can be the factorization of 6×2 + 17x + 5 by splitting the middle term. In this example, one can find two numbers, ‘p’ and ‘q’ in a way such that, p + q = 17 and pq = 6 x 5 = 30. After that one can get the factors.

**What is meant by polynomial ring?**

In mathematics, especially in the field of algebra, a polynomial ring or polynomial algebra is a ring (which is also a commutative algebra) formed from the set of polynomials in one or more indeterminates (traditionally also called variables) with coefficients in another ring, often a field.

### How do you use the factor theorem?

Factor theorem is usually used to factor and find the roots of polynomials. A root or zero is where the polynomial is equal to zero. Therefore, the theorem simply states that when f(k) = 0, then (x – k) is a factor of f(x).

### What is the factor theorem formula?

(x – a) is a factor of f (x), if f (a) = 0. Hence, (x – c) is a factor of the polynomial f (x). Hence, the Factor Theorem is a special case of Remainder Theorem, which states that a polynomial f (x) has a factor x – a, if and only if, a is a root i.e., f (a) = 0.

**Where is factor theorem used?**

#### What are the units in a polynomial ring?

A unit in R is a unit in R[x]. 0 = d(1) = d(fg) ≥ d(f) + d(g). which just sends an element r ∈ R to the constant polynomial r, is a ring homomorphism.

#### Which is an example of the factor theorem?

As discussed in the introduction, a polynomial f (x) has a factor (x-a), if and only if, f (a) = 0. It is one of the methods to do the factorisation of a polynomial. Here we will prove the factor theorem, according to which we can factorise the polynomial. Consider a polynomial f (x) which is divided by (x-c), then f (c)=0.

**How to find the factors of a polynomial?**

The steps are given below to find the factors of a polynomial using factor theorem: Step 1 : If f (-c)=0, then (x+ c) is a factor of the polynomial f (x). Step 2 : If p (d/c)= 0, then (cx-d) is a factor of the polynomial f (x). Step 3 : If p (-d/c)= 0, then (cx+d) is a factor of the polynomial f (x).

## How are ideals related to a factor ring?

Ideals Definition (Ideal). A subring A of a ring R is called a (two-sided) ideal of R if for every r 2 R and every a 2 A, ra 2 A and ar 2 A. Note. (1) A “absorbs” elements of R by multiplication. (2) Ideals are to rings as normal subgroups are to groups.

## What is the purpose of factor theorem class 9?

Go through once and get a clear understanding of this theorem. Factor theorem class 9 maths polynomial enables the children to get a knowledge of finding the roots of quadratic expressions and the polynomial equations, which is used for solving complex problems in your higher studies.