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Tamil Nadu Board of Secondary EducationHSC Science Class 12

If z1 = 3, z2 = 7i, and z3 = 5 + 4i, show that z1(z2 + z3) = z1z2 + z1z3 - Mathematics

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Question

If z1 = 3, z2 = 7i, and z3 = 5 + 4i, show that z1(z2 + z3) = z1z2 + z1z3

Sum

Solution

z1 = 3

z2 = 7i

z3 = 5 + 4i

z2 + z3 = – 7i + 5 + 4i

= 5 – 3i

z1(z2 + z3) = 3(5 – 3i) + 15 – 9i  ........(1)

z1z= 3(– 7i)

= – 21i

z1z= 3(5 + 4i)

= 15 + 12i

z1z+ z1z3 = – 21i + 15 + 12i

= 15 – 9i  ........(2)

∴ From 1 and 2

z1(z2 + z3) = z1z2 + z1z3

Hence proved.

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 2. (i) | Page 60
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