Question

Answer in the form of (a+ib)
Re ((1+i)*(2+i))​

Answer 1

Answer:

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Step-by-step explanation:

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