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