# Now let’s consider a different polynomial g(x) = x^3 + x^2 + 1.

• krispiekr3am
In summary, a polynomial is a mathematical expression made up of variables, coefficients, and mathematical operations. A polynomial function is a function defined by a polynomial expression, with the highest power of the variable being its degree. The roots of a polynomial are the values that make the function equal to zero, and the constant term in a polynomial determines the y-intercept of the function's graph.
krispiekr3am
(a) Prove that g(x) is irreducible over GF(2).

can someone help me?
my email is krispiekr3am@yahoo.com

Have you had any thoughts on the problem?

Sure, I'd be happy to help! First, let's define what it means for a polynomial to be irreducible over GF(2). This means that the polynomial cannot be factored into smaller polynomials over the finite field GF(2), also known as the field of integers modulo 2.

To prove that g(x) is irreducible over GF(2), we can use the following steps:

1. Assume that g(x) can be factored into two polynomials, say f(x) and h(x), over GF(2). This means that g(x) = f(x) * h(x).

2. Since g(x) = x^3 + x^2 + 1, we can write f(x) and h(x) as:

f(x) = x^a + x^b + x^c

h(x) = x^d + x^e + x^f

where a, b, c, d, e, and f are all integers between 0 and 2.

3. Now, we can multiply f(x) and h(x) together and equate it to g(x):

f(x) * h(x) = (x^a + x^b + x^c) * (x^d + x^e + x^f) = x^(a+d) + x^(a+e) + x^(a+f) + x^(b+d) + x^(b+e) + x^(b+f) + x^(c+d) + x^(c+e) + x^(c+f)

4. Since we are working in GF(2), all coefficients and exponents are either 0 or 1. This means that the only possible combinations of exponents that could result in x^3 are:

1+1+1 = 3

1+0+0 = 1

0+1+0 = 1

0+0+1 = 1

This means that the only possible combinations of exponents that could result in x^3 are (1,1,1) and (1,0,0), (0,1,0), (0,0,1) in any order.

5. However, when we look at the expanded form of f(x) * h(x), we see that there is no way to get x^3. This means that our assumption that g(x) can be fact

## 1. What is a polynomial?

A polynomial is a mathematical expression consisting of variables and coefficients, combined using addition, subtraction, and multiplication. It can have one or more terms, with each term containing a variable raised to a non-negative integer power.

## 2. How do you define a polynomial function?

A polynomial function is a function that is defined by a polynomial expression, with the variable as the input and the resulting output as a combination of the coefficients and the variable raised to different powers.

## 3. What is the degree of a polynomial?

The degree of a polynomial is the highest power of the variable in the expression. In the given polynomial g(x) = x^3 + x^2 + 1, the degree is 3, since the variable x is raised to the power of 3 in the first term.

## 4. How do you determine the roots of a polynomial?

The roots of a polynomial are the values of the variable that make the polynomial function equal to zero. They can be determined by factoring the polynomial expression and setting each factor equal to zero, or by using methods such as the quadratic formula for higher degree polynomials.

## 5. What is the significance of the constant term in a polynomial?

The constant term in a polynomial is the term that does not contain the variable. In the given polynomial g(x) = x^3 + x^2 + 1, the constant term is 1. It is significant because it determines the y-intercept of the polynomial function, which is the point where the graph of the function intersects with the y-axis.

• Linear and Abstract Algebra
Replies
3
Views
786
• Linear and Abstract Algebra
Replies
5
Views
956
• Linear and Abstract Algebra
Replies
6
Views
2K
• Linear and Abstract Algebra
Replies
8
Views
1K
• Linear and Abstract Algebra
Replies
2
Views
1K
• Linear and Abstract Algebra
Replies
3
Views
1K
• Linear and Abstract Algebra
Replies
3
Views
1K
• Linear and Abstract Algebra
Replies
2
Views
994
• Linear and Abstract Algebra
Replies
13
Views
1K
• Linear and Abstract Algebra
Replies
8
Views
2K