Question

The equation $z\bar{z}$ + (4 – 3i) z + (4 + 3i)$\bar{z}$ + 5 = 0 represents a circle, whose radius is –

• A. 2
• B. $\frac{5}{2}$
• C. $2\sqrt{5}$
• D. 5

Answer 1

Answer: (C)

$2\sqrt{5}$

Answer 2

Sol. a = 4 + 3i –® r = $\sqrt{|a|^{2}–b}$= $\sqrt{25–5}$ = $2\sqrt{5}$