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adelina 88 [10]
3 years ago
12

Simplify the answer

Mathematics
1 answer:
Andru [333]3 years ago
8 0

Answer:

- 20 + 8i

Step-by-step explanation:

Noting that i²  = - 1

Given

[(6i + 9) + (4i - 5)] × 2i ← evaluate the terms inside the square bracket

= ( 6i + 9 + 4i - 5 ) × 2i

= (10i + 4) × 2i ← multiply each term in the parenthesis by 2i

= 20i² + 8i

= 20(- 1) + 8i

= - 20 + 8i

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