Which complex number is equivalent to (5 + 12i) − (9i2 − 6i), where i = −1 ?

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asked Dec 15, 2021 178k views

5 votes

Which complex number is equivalent to (5 + 12i) − (9i2 − 6i), where i =
−1
?

Mathematics
middle-school

Rana Soyab asked

by Rana Soyab

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2 Answers

2 votes

Answer: It's 14+18i I got a correct

Serpiton answered Dec 15, 2021

by Serpiton

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4 votes

Answer:

14 + 18i

Explanation:

$(5 + 12i) - (9 {i}^(2) - 6i) \\ = (5 + 12i) - (9 * (- 1) - 6i) \\ = (5 + 12i) - ( - 9 - 6i) \\ = (5 + 12i) + ( 9 + 6i) \\ = 5 + 12i + 9 + 6i \\ \red { \bold{ = 14 + 18i}}$

Rinor answered Dec 19, 2021

by Rinor

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