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# Introduction

Complex numbers are useful in representing a phenomenon that has two parts varying at the same time, for instance an alternating current.

Complex Numbers

ŌĆ£Imaginary numbers are a ’¼üne and wonderful refuge of the divine spirit almost an amphibian between being and non-being. ŌĆØ

- Gottfried Leibniz

Many mathematicians contributed to the full development of complex numbers. The rules for addition, subtraction, multiplication, and division of complex numbers were developed by the Italian mathematician Rafael Bombelli. He is generally regarded as the first person to develop an algebra of complex numbers. In honour of his accomplishments, a moon crater was named Bombelli.

Complex numbers are useful in representing a phenomenon that has two parts varying at the same time, for instance an alternating current. Engineers, doctors, scientists, vehicle designers and others who use electromagnetic signals need to use complex numbers for strong signal to reach its destination. Complex numbers have essential concrete applications in signal processing, control theory, electromagnetism, fluid dynamics, quantum mechanics, cartography, and vibration analysis. ## Learning Objectives

Upon completion of this chapter, students will be able to:

ŌŚÅ     perform algebraic operations on complex numbers

ŌŚÅ     plot the complex numbers in Argand plane

ŌŚÅ     find the conjugate and modulus of a complex number

ŌŚÅ     find the polar form and Euler form of a complex number

ŌŚÅ     apply de Moivre theorem to find the nth roots of complex numbers.

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12th Mathematics : UNIT 2 : Complex Numbers : Introduction | Complex Numbers