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8i-(12-4i)+7√-9 show work please

8i-(12-4i)+7√-9 show work please
132k views
3 votes
8i-(12-4i)+7√-9

show work please

User ChristopheCVB
by
7.2k points

1 Answer

5 votes

Answer:

33i - 12

Explanation:


8i - (12 - 4i) + 7 √( - 9) \\ = 8i - 12 + 4i + 7 √(9 * ( - 1)) \\ = 12i - 12 + 7 * 3 √( - 1) \\ = 12i - 12 + 21i \: \: ( \because √( - 1) = i)\\ = 12i + 21i - 12 \\ \therefore \red{ \bold{8i - (12 - 4i) + 7 √( - 9) }= \purple{ \bold{33i - 12}}}

User Rohit Waghela
by
8.5k points
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