Question

Ajuda no item c e d, por favor!!

Answer 1

$P(-i)=a(-i)^2+b(i)+c\\ P(-i)=-a+bi+c=(c-a)+bi\\ (c-a)+bi = 4+ i\iff c-a=4 \wedge b=1\;\cdots\cdots\textcircled{1}\\ \\ \\ P(2)=3\\ 4a+2b+c=3\\ \\ \text{De }\textcircled{1}: 4a+c=1\Longrightarrow a= -3/5\,;\, c=17/5$

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$P(1)=a+b+c\\ \boxed{a+b+c=0}$