Which Equation Has No Real Solutions

Which Equation Has No Real Solutions?


In mathematics, an equation is a statement that asserts the equality of two mathematical expressions. Solving an equation involves finding the values of the variables that make the equation true. However, not all equations have real solutions. In this article, we will explore the concept of equations with no real solutions and discuss some common examples.

What are Real Solutions?

Real solutions refer to the values of the variables in an equation that satisfy the equation and are real numbers. In other words, a real solution is a value that, when substituted into the equation, makes both sides of the equation equal. For example, in the equation x^2 – 4 = 0, the real solutions are x = 2 and x = -2.

What are Imaginary Solutions?

On the other hand, imaginary solutions are values that, when substituted into the equation, do not satisfy the equation and produce an imaginary number. An imaginary number is a complex number that can be expressed as a real number multiplied by the imaginary unit, denoted by the symbol “i.” For example, the equation x^2 + 1 = 0 has no real solutions, but it has two imaginary solutions: x = i and x = -i.

Examples of Equations with No Real Solutions:

1. x^2 + 1 = 0:
This equation has no real solutions because there is no real number that, when squared, can result in a negative value. As mentioned earlier, the solutions are imaginary: x = i and x = -i.

2. x^2 – 9 = 0:
This equation can be factored as (x – 3)(x + 3) = 0. Therefore, the solutions are x = 3 and x = -3, which are real solutions.

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3. 2x^2 + 4x + 10 = 0:
Using the quadratic formula, we find the solutions to be x = -1 + 2i and x = -1 – 2i. These solutions are imaginary as they involve the square root of a negative number.

4. x^3 + 8 = 0:
This equation can be factored as (x + 2)(x^2 – 2x + 4) = 0. The first factor gives us the real solution x = -2, while the second factor does not have any real solutions.

Frequently Asked Questions (FAQs):

Q1. Can an equation have both real and imaginary solutions?
Yes, an equation can have a combination of real and imaginary solutions. For example, the equation x^2 + 1 = 0 has two imaginary solutions (x = i and x = -i), while the equation x^2 – 4 = 0 has two real solutions (x = 2 and x = -2).

Q2. How can we determine if an equation has real or imaginary solutions?
To determine if an equation has real or imaginary solutions, we can analyze the discriminant of the equation. For a quadratic equation of the form ax^2 + bx + c = 0, the discriminant is given by the expression b^2 – 4ac. If the discriminant is positive, the equation has two distinct real solutions. If it is zero, the equation has one real solution (known as a double root). If the discriminant is negative, there are two imaginary solutions.

Q3. Can an equation have no real or imaginary solutions?
No, every equation must have at least one solution, whether it is real or imaginary. This is a fundamental concept in mathematics known as the Fundamental Theorem of Algebra.


Equations with no real solutions can be solved using imaginary numbers. Understanding the concept of real and imaginary solutions is crucial in various branches of mathematics and science. Equations with no real solutions often arise when dealing with complex mathematical problems, and they can be solved by applying appropriate mathematical techniques.

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