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Is z*\(\bar{z}\) = |z|^2?(a) True(b) FalseThis question was addressed to me in an interview.My query is from Complex Numbers-2 in portion Complex Numbers and Quadratic Equations of Mathematics – Class 11

Answer»

Right answer is (a) True

For explanation: Let Z=a+ bi

=>\(\BAR{z}\) = a-bi

So, z*\(\bar{z}\) = (a+bi) (a-bi) = a^2-(bi)^2 = a^2-(b^2) (-1) = a^2+b^2

|z|=\(\sqrt{a^2+b^2}\) => |z|^2 = a^2+b^2

Hence, z*\(\bar{z}\) = |z|^2.



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