Question

qual o valor numerico do polinômio,onde temos Q(x)=2-4ix-3 quando x=2-i

Answer 1

$Q(x)=2-4ix-3 \\ \\ x=2-i \\ \\ Q(x)=2-4i(2-i)-3 \\ \\ Q(x)=2-8i+4i^2-3 \\ \\ Q(x)=2-8i-4-3 \\ \\ \boxed{\boxed{Q(x)=-5-8i}}$