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Tamil Nadu Board of Secondary EducationHSC Science Class 12

If z1 = 1 – 3i, z2 = – 4i, and z3 = 5, show that (z1 z2)z3 = z1(z2 z3) - Mathematics

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Question

If z1 = 1 – 3i, z2 = – 4i, and z3 = 5, show that (z1 z2)z3 = z1(z2 z3)

Sum

Solution

(z1 z2) z3 = [(1 – 3i)(– 4i)]5

= [– 4i + 12i2]5

= [– 12 – 4i]5

= – 60 – 20i  ........(1)

z1(z2 z3) = (1 – 3i)[(– 4i)(5)]

= (– 20i + 60i2)

= – 20i – 60  .......(2)

From (1) and (2) we get

∴ (z1 z2)(z3) = z1(z2 z3)

shaalaa.com
Basic Algebraic Properties of Complex Numbers
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Chapter 2: Complex Numbers - Exercise 2.3 [Page 60]

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Samacheer Kalvi Mathematics - Volume 1 and 2 [English] Class 12 TN Board
Chapter 2 Complex Numbers
Exercise 2.3 | Q 1. (ii) | Page 60
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