Question

1.Aratati ca modulul nr complex z=5-12i este 13

Answer 1

Salut,

$|z|=\sqrt{5^2+(-12)^2}=\sqrt{25+144}=\sqrt{169}=\sqrt{13^2}=13,\ ceea\ ce\\\\ trebuia\ demonstrat.$

Green eyes.

Answer 2

|z|=V(a^2+b^2)=V(5^2+(-12)^2)=V(25+144)=V169=13