sophie1814
sophie1814
14-12-2020
Mathematics
contestada
DOES ANYONE KNOW THIS??
Respuesta :
009721
009721
14-12-2020
Answer:
49-9i²
Step-by-step explanation:
(7+3i)(7-3i)
expand the brackets
49-21i +21i -9i²
49-9i²
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