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Which Equation Has 1-i as a Solution?

Introduction:

Complex numbers are numbers that consist of a real and imaginary part. They are used in various branches of mathematics, science, and engineering. In this article, we will discuss equations that have 1-i as a solution, explore their properties, and provide examples to enhance our understanding.

Equations with 1-i as a Solution:

To find an equation with 1-i as a solution, we can start by considering a generic complex number in the form a + bi, where a and b are real numbers. If this complex number satisfies an equation, replacing a with 1 and b with -1 will give us an equation with 1-i as a solution.

Let’s consider a quadratic equation as an example: ax^2 + bx + c = 0, where a, b, and c are real numbers. We substitute x with 1-i:

a(1-i)^2 + b(1-i) + c = 0

Expanding and simplifying:

a(1-2i+i^2) + b(1-i) + c = 0

a(1-2i-1) + b(1-i) + c = 0

a(-2i) + b(1-i) + c = 0

-2ai + b(1-i) + c = 0

Matching the real and imaginary parts:

-2ai + b – bi + c = 0

Since 1-i is a solution, the real and imaginary parts must both equal zero:

b + c = 0 (Equation 1)

-2a – b = 0 (Equation 2)

We now have a system of equations that can be solved simultaneously. By solving these equations, we can find the values of a, b, and c that satisfy the condition of having 1-i as a solution.

FAQs:

1. What are complex numbers?

Complex numbers are numbers that consist of a real part and an imaginary part. They are written in the form a + bi, where a is the real part and bi is the imaginary part.

2. How do we solve equations with complex solutions?

To solve equations with complex solutions, we substitute the complex number into the equation and manipulate the equation to solve for the variables. We can use the fact that the real and imaginary parts of the complex number must satisfy the equation.

3. Can an equation have both real and complex solutions?

Yes, an equation can have both real and complex solutions. It depends on the nature of the equation and the coefficients involved. Quadratic equations, for example, can have real, complex, or repeated solutions.

4. Are complex numbers used in real-world applications?

Yes, complex numbers are widely used in various fields such as engineering, physics, and computer science. They are used in electrical engineering to analyze AC circuits, in signal processing for data analysis, and in quantum mechanics to describe physical phenomena.

5. Can complex numbers be graphed?

Complex numbers can be graphed on a two-dimensional plane known as the complex plane. The real part is plotted on the x-axis, and the imaginary part is plotted on the y-axis. The position of a complex number on the complex plane can represent its magnitude and direction.

Conclusion:

Equations with complex solutions, such as 1-i, can be solved by substituting the complex number into the equation and manipulating it to find the desired variables. By analyzing the real and imaginary parts of the complex number, we can determine the conditions for an equation to have 1-i as a solution. Complex numbers have various applications in mathematics and the sciences, making them an essential concept to understand.

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