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JEE Mains · Maths · STD 11 - 4.1 complex nubers

माना एक सम्मिश्र संख्या \(z\) इस प्रकार है कि \(| z |+ z =3+ i (\) जहाँ \(i =\sqrt{-1})\), तो \(| z |\) बराबर है 

  1. A \(\frac{{\sqrt {34} }}{3}\)
  2. B \(\frac{5}{3}\)
  3. C \(\frac{{\sqrt {41} }}{4}\)
  4. D \(\frac{5}{4}\)
Verified Solution

Answer & Solution

Correct Answer

(B) \(\frac{5}{3}\)

Step-by-step Solution

Detailed explanation

\(z\, = \,x\, + \,iy\) \(\sqrt {{x^2} + {y^2}} \, + \,x\, + \,iy\, = \,3\, + \,i\) \( \Rightarrow \,y = 1\) \(\sqrt {{x^2} + 1} \, + \,x = 3 \Rightarrow {x^2}\, + \,1 = 9 - 6x + {x^2}\) \( \Rightarrow \,x = \frac{4}{3}\) \(|z|\, = \,\sqrt {{x^2}\, + \,{y^2}} \, = \,\frac{5}{3}\)
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