# Introduction of Complex Number - Complex Numbers - - Diploma Maths II | Summary and Q&A

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August 6, 2019
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Introduction of Complex Number - Complex Numbers - - Diploma Maths II

## TL;DR

Complex numbers involve a combination of real numbers and imaginary numbers, allowing for mathematical operations that cannot be performed with real numbers alone.

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### Q: What led to the development of complex numbers?

Complex numbers were introduced to solve quadratic functions that yielded square roots of negative numbers, which were considered imaginary. This led to the concept of complex numbers.

### Q: How is the imaginary unit "i" defined?

The imaginary unit "i" represents the square root of -1. It is a fundamental component of complex numbers and is used to express the imaginary part.

### Q: Can complex numbers be expressed in a standard form?

Yes, complex numbers can be written in the standard form as a + bi, where "a" represents the real part and "b" represents the imaginary part.

### Q: What are the major applications of complex numbers?

Complex numbers find applications in various fields, including signal systems, quantum mechanics, engineering sciences, and control theories. They allow for advanced mathematical modeling and analysis.

## Summary & Key Takeaways

• Complex numbers were introduced to deal with the square root of negative numbers and are defined as a combination of a real part and an imaginary part.

• The imaginary unit, denoted as "i," is equal to the square root of -1.

• Complex numbers can be expressed in the standard form as a + bi, where "a" represents the real part and "b" represents the imaginary part.

• Complex numbers find applications in various fields, including signal systems, quantum mechanics, engineering sciences, and control theories.