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Imaginary Numbers
Last updated at May 11, 2026 by Teachoo
Real Numbers & Imaginary Numbers
Class 9
Chapter 3 Class 9 - The World of Numbers (Ganita Manjari I)
- The Human Need to Count
- Exercise Set 3.1
- The Revolution of Śhūnya
- Integers
- Exercise Set 3.2
- Rational Numbers
- Exercise Set 3.3
- Rational Numbers on the Number Line
- Absolute Value of a Rational Number
- Rational Numbers between two Rational numbers
- Exercise Set 3.4
- Irrational Numbers
- Construction of Length √n on Number line
- The Story of Pi (π) and Madhava’s Infinite Series
-
Real Numbers & Imaginary Numbers
- Decimal Expansion of Real Numbers
- Magic of Cyclic Numbers
- Constructing a Square Root Spiral
- Exercise Set 3.5
- End-of-Chapter Exercises
Transcript
Imaginary Numbers The Problem: Find the square root of a negative number. E.g., and . No real number squares to give a negative.The Solution: Meet ' ', the Imaginary Unit! Definition: Key Property: How ' ' Works: Simple Examples. (2)So, how do we define imaginary numbers? Imaginary numbers are those numbers whose square is a negative number We define these numbers by the unit I Where Imaginary Negative Imaginary Numbers on the number line Imaginary numbers do not exist on the standard horizontal real number line
