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crisdelshine
@crisdelshine
October 2020
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UNIDADE IMAGINÁRIA
Sendo i a unidade imaginária, a expressão 2 + 3i + ( 3 + i ).( 4 - i ) resulta igual a:
a) 13 + 4i
b) 15 + 4i
c) 13 + 3i
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sukkerspinn
2 + 3i + ( 3 + i ).( 4 - i )
2 + 3i + 12 - 3i + 4i - i^2
14 + 1 + 4i
15 + 4i
\obs .: i^2 = - 1
1 votes
Thanks 1
3478elc
Verified answer
2 + 3i + (3 + i).(4 - i) =
2 + 3i + 12 - 3i + 4i - i² =
2 + 3i + 12 - 3i + 4i - (- 1) =
2 + 3i + 12 - 3i + 4i + 1 =
15 + 4i ---> letra b.
--> Primeiramente, resolver o que tá multiplicando: ((3 + i).(4 - i))
--> i² = - 1
0 votes
Thanks 0
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Lista de comentários
2 + 3i + ( 3 + i ).( 4 - i )
2 + 3i + 12 - 3i + 4i - i^2
14 + 1 + 4i
15 + 4i
\obs .: i^2 = - 1
Verified answer
2 + 3i + (3 + i).(4 - i) =2 + 3i + 12 - 3i + 4i - i² =
2 + 3i + 12 - 3i + 4i - (- 1) =
2 + 3i + 12 - 3i + 4i + 1 =
15 + 4i ---> letra b.
--> Primeiramente, resolver o que tá multiplicando: ((3 + i).(4 - i))
--> i² = - 1