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Question

State True and False
The complex numbers z which satisfy the inequality log1/3|z+1|>log1/3|z1| are such that their real part is -ve .

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Solution

Yes, true.Since base 1/3 is less than 1, so given inequality holds if |z+1|<|z1| or (x+1)2+y2<(x1)2+y2 or 4x<0 or Re(z)<0

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