La7tt0anisabe
La7tt0anisabe
04-06-2016
Mathematics
contestada
(-3 - 5i)(-3 + 5i) =
Respuesta :
caylus
caylus
04-06-2016
Hello,
You don't know (a-b)(a+b)=a²-b²?
(-3)²=9
(5i)²=-25
Answer 9 +25=34
Answer Link
Panoyin
Panoyin
05-06-2016
(-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
Answer Link
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