Question

Please help me out and explain it to me​

Answer 1

Answer is option d 14+18i

Explanation:

`given \: expression \: is \\ (5 + 12i) - (9 {i}^(2) - 6i) \: \: \: where \: i = √( - 1) \: \: \\ = 5 + 12i - 9 {i }^(2) + 6i \\ = 18i + 5 - 9( - 1) \\ 18i + 5 + 9 \\ = 18i + 14`

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