Question

(2+i)^2-i×(2+i)×(2-1)
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Answer 1

Resposta:

${(2 + i)}^{2} - i(2 + i)(2 - i) \\ 4 + 4i + {i}^{2} - i (4-{i}^{2})\\ 4 +4i-1 - i (4+1)\\3+4i-5i\\3-i$