Recall of Polynomial Properties

Oct 13, 2025 by wbrum.org 52 views

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Introduction

In algebra, polynomials are a fundamental concept that helps us solve various mathematical problems. A polynomial is an expression consisting of variables and coefficients combined using only addition, subtraction, and multiplication. In this article, we will focus on solving a specific type of polynomial equation, where the zeroes of the polynomial are given as 'a' and 'ẞ'. We will use these zeroes to find the value of the expression (a + ẞ + aẞ).

Understanding the Problem

The given polynomial equation is p(x) = x² - ax - b, where 'a' and 'ẞ' are the zeroes of the polynomial. We are asked to find the value of the expression (a + ẞ + aẞ). To solve this problem, we need to use the properties of polynomial equations and the relationship between the zeroes and coefficients of a polynomial.

Recall of Polynomial Properties

Before we dive into the solution, let's recall some important properties of polynomial equations:

The sum of the zeroes of a polynomial is equal to the negation of the coefficient of the x term, divided by the coefficient of the x² term.
The product of the zeroes of a polynomial is equal to the constant term, divided by the coefficient of the x² term.

Using Vieta's Formulas

Vieta's formulas provide a relationship between the coefficients of a polynomial and its zeroes. For a quadratic polynomial of the form x² + px + q = 0, Vieta's formulas state that:

The sum of the zeroes is equal to -p.
The product of the zeroes is equal to q.

In our case, the polynomial is p(x) = x² - ax - b. We can rewrite it as x² + ax + b = 0. Using Vieta's formulas, we can write:

a + ẞ = -a (since the sum of the zeroes is equal to -p)
aẞ = b (since the product of the zeroes is equal to q)

Solving for (a + ẞ + aẞ)

Now that we have the relationships between 'a', 'ẞ', and 'b', we can solve for (a + ẞ + aẞ). We can start by substituting the value of a + ẞ from the first equation:

a + ẞ + aẞ = -a + aẞ

Next, we can substitute the value of aẞ from the second equation:

a + ẞ + aẞ = -a + b

Conclusion

In this article, we used Vieta's formulas to find the value of the expression (a + ẞ + aẞ) given the polynomial p(x) = x² - ax - b. We found that the value of (a + ẞ + aẞ) is equal to -a + b. This solution demonstrates the importance of understanding the properties of polynomial equations and using Vieta's formulas to solve problems involving zeroes and coefficients.

Final Answer

The final answer is:

(D) -a+b

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Q: What are the zeroes of a polynomial?

A: The zeroes of a polynomial are the values of x that make the polynomial equal to zero. In other words, they are the solutions to the equation p(x) = 0.

Q: How do I find the zeroes of a polynomial?

A: To find the zeroes of a polynomial, you can use various methods such as factoring, the quadratic formula, or graphing. The method you choose will depend on the type of polynomial and the complexity of the equation.

Q: What is Vieta's formulas?

A: Vieta's formulas are a set of relationships between the coefficients of a polynomial and its zeroes. For a quadratic polynomial of the form x² + px + q = 0, Vieta's formulas state that:

The sum of the zeroes is equal to -p.
The product of the zeroes is equal to q.

Q: How do I use Vieta's formulas to solve a polynomial equation?

A: To use Vieta's formulas to solve a polynomial equation, you need to identify the coefficients of the polynomial and the zeroes. Then, you can use the formulas to find the sum and product of the zeroes. From there, you can solve for the unknown values.

Q: What is the difference between the sum and product of the zeroes?

A: The sum of the zeroes is the sum of the values of x that make the polynomial equal to zero. The product of the zeroes is the product of the values of x that make the polynomial equal to zero.

Q: How do I apply Vieta's formulas to the given polynomial p(x) = x² - ax - b?

A: To apply Vieta's formulas to the given polynomial p(x) = x² - ax - b, you need to identify the coefficients and the zeroes. The coefficients are a and b, and the zeroes are a and ẞ. Then, you can use the formulas to find the sum and product of the zeroes.

Q: What is the value of (a + ẞ + aẞ) given the polynomial p(x) = x² - ax - b?

A: The value of (a + ẞ + aẞ) is equal to -a + b.

Q: Can I use Vieta's formulas to solve any type of polynomial equation?

A: Yes, Vieta's formulas can be used to solve any type of polynomial equation, including quadratic, cubic, and higher-degree polynomials.

Q: What are some common applications of Vieta's formulas?

A: Vieta's formulas have many applications in mathematics, science, and engineering. Some common applications include:

Solving polynomial equations
Finding the roots of a polynomial
Determining the stability of a system
Analyzing the behavior of a system

Q: How do I remember Vieta's formulas?

A: To remember Vieta's formulas, you can use the following mnemonic device:

Sum of zeroes = -p
Product of zeroes = q

This will help you remember the formulas and apply them to solve polynomial equations.