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Brrunno [24]
3 years ago
12

(-3 - 5i)(-3 + 5i) =

Mathematics
2 answers:
Black_prince [1.1K]3 years ago
6 0
Hello,
You don't know (a-b)(a+b)=a²-b²?

(-3)²=9
(5i)²=-25
Answer 9 +25=34


Lilit [14]3 years ago
5 0
(-3 - 5i)(-3 + 5i)
-3(-3 + 5i) - 5i(-3 + 5i)
-3(-3) - 3(5i) - 5i(-3) - 5i(5i)
9 - 15i + 15i - 25i²
9 - 25(-1)
9 + 25
34
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