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Lapatulllka [165]
3 years ago
13

DOES ANYONE KNOW THIS??

Mathematics
1 answer:
3241004551 [841]3 years ago
6 0

Answer:

49-9i²

Step-by-step explanation:

(7+3i)(7-3i)

expand the brackets

49-21i +21i -9i²

49-9i²

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