##### Complex Numbers and Quadratic Equations – Notes

**Introduction to Complex Numbers**

A number whose square is negative is called an imaginary number.

A number of the form a + ib, where a and b are real numbers, is called a complex number and is represented by Z.

In the complex number z = a + ib,

- a: Real part of the complex number, denoted by
**Re z** - b: imaginary part of the complex number, denoted by
**Im z**

If the imaginary part of a complex number is zero, then the number is called a purely real number.

If the real part of a complex number is zero, then the number is called a purely imaginary number.

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Class 11th Maths 5 - Complex Numbers and Quadratic Equations - Notes

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