Question

The equation $z \bar{z}+(2-3 i) z+(2+3 i) \bar{z}+4=0$ represents a circle of radius
(A) 2 unit
(B) 3 unit
(C) 4 unit
(D) 6 unit

Answer 1

Ans : (B)
Hint : Centre and radius of $z \bar{z}+\bar{a} z+a \bar{z}+b=0$ are $-a$ and $\sqrt{|a|^{2}-b} \quad \therefore$ radius $=\sqrt{13-4}=3$

Answer 2

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Answer 3

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