What Is A Real Root?

Are you curious to know what is a real root? You have come to the right place as I am going to tell you everything about a real root in a very simple explanation. Without further discussion let’s begin to know what is a real root?

In the realm of mathematics, “real roots” are fundamental and essential concepts that play a pivotal role in various fields, from algebra and calculus to engineering and science. They are the building blocks for understanding equations and functions. In this blog post, we will explore what real roots are, how they are defined, and their significance in mathematics and real-world applications.

What Is A Real Root?

In mathematics, a “root” refers to a solution or value that satisfies an equation or polynomial. Specifically, a “real root” is a value of the variable (typically denoted as “x”) that makes the equation or polynomial equal to zero. In other words, it’s the point at which a graph of the equation crosses the x-axis.

Key Characteristics Of Real Roots:

  • Zero Value: A real root is a value of the variable that, when substituted into the equation or polynomial, results in an output of zero.
  • Linear and Nonlinear: Real roots can be found in both linear equations (e.g., ax + b = 0) and nonlinear equations (e.g., x^2 – 4 = 0).
  • Multiplicity: Some equations or polynomials may have multiple real roots, each with its own multiplicity, which indicates the number of times the root appears as a solution.

Example Of A Linear Equation With A Real Root:

Consider the linear equation: 2x – 6 = 0

To find the real root of this equation, we isolate the variable x:

2x – 6 = 0

2x = 6

x = 6/2

x = 3

So, the real root of the equation 2x – 6 = 0 is x = 3.

Significance Of Real Roots

  1. Solving Equations: Real roots are crucial for solving equations, both in algebra and engineering. They provide solutions to various real-world problems, such as calculating distances, time, and rates in physics and engineering.
  2. Graphical Representation: Real roots help define the x-intercepts of a function’s graph. They indicate where the function crosses the x-axis and provide valuable information about the function’s behavior.
  3. Polynomial Factorization: The presence of real roots in a polynomial equation is closely related to its factorization. The Fundamental Theorem of Algebra states that a polynomial equation with real coefficients will have as many real roots as its degree.
  4. Stability Analysis: In fields like control theory and differential equations, real roots are used to analyze the stability of systems. The location of real roots can determine whether a system is stable, unstable, or marginally stable.
  5. Roots of Unity: Real roots are a subset of complex roots. Complex roots are used in various mathematical applications, including trigonometry, signal processing, and quantum mechanics.


Real roots are fundamental concepts in mathematics with wide-ranging applications in various disciplines. They serve as solutions to equations, guide graphical representations of functions, and play a crucial role in understanding polynomial behavior. Their significance extends beyond the classroom, as they are essential tools for solving real-world problems, analyzing systems, and exploring the mysteries of the mathematical universe.

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What Is A Real Root In Math?

Explanation: Given an equation in a single variable, a root is a value that can be substituted for the variable in order that the equation holds. In other words it is a “solution” of the equation. It is called a real root if it is also a real number.

How Do You Know If It’s A Real Root?

When discriminant is greater than zero, the roots are unequal and real. When discriminant is equal to zero, the roots are equal and real. When discriminant is less than zero, the roots are imaginary.

What Is A Real And Non Real Root?

The difference between real and imaginary roots:

Real roots are the values of x where the graph of the function actually crosses the x-axis. Real roots are any roots that don’t have an “i” term. Imaginary roots are values of x that make the function equal zero, but the graph doesn’t actually cross the x-axis.

Is √5 Real?

It is an irrational algebraic number. The first sixty significant digits of its decimal expansion are: 2.23606797749978969640917366873127623544061835961152

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