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Introduction to Imaginary Numbers Video Lecture | Mathematics (Maths) for JEE Main & Advanced

209 videos|443 docs|143 tests

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00:03 Real numbers
00:16 Rational numbers
00:23 Irrational numbers
01:20 Roots of a quadratic equations
02:51 Negative 1 - unit imaginary number
03:53 Imaginary roots of a quadratic equation
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FAQs on Introduction to Imaginary Numbers Video Lecture - Mathematics (Maths) for JEE Main & Advanced

1. What are imaginary numbers and how are they defined?
Ans. Imaginary numbers are numbers that can be written as a real number multiplied by the imaginary unit "i," which is defined as the square root of -1. They are used to extend the real number system to include solutions to certain equations that do not have real number solutions.
2. How are imaginary numbers represented on the complex plane?
Ans. Imaginary numbers are represented on the complex plane, where the horizontal axis represents the real part of the number and the vertical axis represents the imaginary part. The number a + bi is plotted as the point (a, b) on the complex plane.
3. What is the relationship between imaginary numbers and real numbers?
Ans. Imaginary numbers are closely related to real numbers, as they can be combined to form complex numbers. Complex numbers have a real part and an imaginary part, and can be added, subtracted, multiplied, and divided just like real numbers.
4. What are some common operations involving imaginary numbers?
Ans. Common operations involving imaginary numbers include addition, subtraction, multiplication, division, and taking the conjugate. The conjugate of a complex number a + bi is a - bi, where the sign of the imaginary part is changed.
5. How are imaginary numbers used in real-world applications?
Ans. Imaginary numbers are used in various fields such as physics, engineering, and signal processing to model and analyze systems that involve oscillations, waves, and electrical circuits. They are also used in solving differential equations and in quantum mechanics.
209 videos|443 docs|143 tests
Video Timeline
Video Timeline
arrow
00:03 Real numbers
00:16 Rational numbers
00:23 Irrational numbers
01:20 Roots of a quadratic equations
02:51 Negative 1 - unit imaginary number
03:53 Imaginary roots of a quadratic equation
More
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