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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