this is given in book....

|z|^2 – 2|z| – 4

then {|z| – 1 + sqrt(5)} {|z| – 1 – sqrt(5)}

so 1 – sqrt(5)

but after using quadratic formula we get

1 – sqrt(3)

Why the difference??

Meghendra Agrawal

7 Years agoGrade