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Algebra of Complex Numbers Video Lecture | Mathematics (Maths) Class 11 - Commerce

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FAQs on Algebra of Complex Numbers Video Lecture - Mathematics (Maths) Class 11 - Commerce

1. What is the algebraic representation of a complex number?
Ans. A complex number can be represented algebraically as a sum of a real part and an imaginary part, written in the form a + bi, where a is the real part and bi is the imaginary part.
2. How do you add two complex numbers?
Ans. To add two complex numbers, you simply add their real parts and imaginary parts separately. For example, to add (3 + 2i) and (1 - 4i), you add the real parts (3 + 1 = 4) and the imaginary parts (2 + (-4) = -2), resulting in the sum of (4 - 2i).
3. Can you multiply complex numbers?
Ans. Yes, complex numbers can be multiplied. To multiply two complex numbers, you apply the distributive property and then use the fact that i^2 is equal to -1. For example, to multiply (2 + 3i) and (4 - 5i), you multiply the real parts (2 * 4 = 8), multiply the imaginary parts (3i * -5i = -15i^2 = 15), and then combine them to get the product of (8 + 15i).
4. How do you find the conjugate of a complex number?
Ans. The conjugate of a complex number is obtained by changing the sign of its imaginary part. For example, the conjugate of (3 + 2i) would be (3 - 2i). The conjugate of a complex number is useful when dividing complex numbers or simplifying expressions involving complex conjugates.
5. What is the modulus of a complex number?
Ans. The modulus (or absolute value) of a complex number is its distance from the origin on the complex plane. It can be found by taking the square root of the sum of the squares of its real and imaginary parts. For example, the modulus of (3 + 4i) would be sqrt(3^2 + 4^2) = 5. Modulus is often used to measure the magnitude or size of a complex number.
75 videos|238 docs|91 tests

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