Question

9. 12i2 – 4i2 + 8,2 – 4i2=
(a) 1
(b) 0
(c) 4
(d) 4​

Answer 1

Answer:

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Answer 2

THIS IS ONE EXAMPLE

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Question 1:

Express the given complex number in the form a + ib: (5i)(-3i/5)

Answer:

(5i)(-3i/5) = (-5 * 3/5) * i * i

= -3 * i2

= -3 * (-1) [Since i2 = -1]

= 3

Question 2:

Express the given complex number in the form a + ib: i9 + i19

Answer:

i9 + i19 = i4*2 + 1 + i4*4 + 3

= (i4)2 * i + (i4)4 * i3

= (1)2 * i + (1)4 * i * i2 [Since i4 = 1]

= i + i * (-1) [Since i2 = -1]

= i – i

= 0

Question 3:

Express the given complex number in the form a + ib: i-39

Answer:

i-39 = i-4 * 9 - 3

= (i-4)9 * i-3

= 19 * i-3 [Since i4 = 1]

= i-3

= 1/ i3

= i4/ i3 [Since i4 = 1]

= i