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kaitlksndj
17.01.2020 •
Mathematics
Given equation x = 6 + i, w = -1 + 5i and z = 4 - 8i, determine each of the following in the form of a + bi
i) 2x + 4z
ii) w x z
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Ответ:
i) 28 - 30i
ii) 36 + 28i
Step-by-step explanation:
i) x = 6 + i ⇒2x = 2(6 + i) = 12 + 2i
z = 4 - 8i ⇒ 4z = 4(4 - 8i) = 16 - 32i
2x + 4z = (12 + 2i) + (16 - 32i) = 28 - 30i
ii) w = -1 + 5i and z = 4 - 8i
w × z = (-1 + 5i)(4 - 8i) = -4 + 8i + 20i - 40
⇒collect like terms
w × z = -4 + 28i - 40![i^{2}](/tpl/images/0459/2883/a97fc.png)
∵![i^{2}=-1](/tpl/images/0459/2883/ebd83.png)
∴w × z = -4 + 28i - 40(-1) = -4 + 28i + 40 = 36 + 28i
Ответ: