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JEE Main 202126 AugustEvening Shift
Exam
JEE Main
Year
2021
Date
26 August
Shift
Evening Shift
Subject
Mathematics
Chapter
Complex Number

JEE Main 2021 · 26 August · Evening Shift · Mathematics · Complex Number

If ( 3 + i ) ^ 100 = 2 ^ 99 ( p + iq ) , then p and q are roots of...

If (3+i)100=299(p+iq),( \sqrt{3} + i{)}^{100} = {2}^{99} ( p + iq ) , then pp and qq are roots of the equation :

Options

  1. Ax2−(3+1)x+3=0{x}^{2} - ( \sqrt{3} + 1 ) x + \sqrt{3} = 0
  2. Bx2+(3+1)x+3=0{x}^{2} + ( \sqrt{3} + 1 ) x + \sqrt{3} = 0
  3. Cx2+(3−1)x−3=0{x}^{2} + ( \sqrt{3} - 1 ) x - \sqrt{3} = 0
  4. Dx2−(3−1)x−3=0{x}^{2} - ( \sqrt{3} - 1 ) x - \sqrt{3} = 0

Correct answer

D. x2−(3−1)x−3=0{x}^{2} - ( \sqrt{3} - 1 ) x - \sqrt{3} = 0

Step-by-step solution

(3+i)100=299(p+iq)( \sqrt{3} + i{)}^{100} = {2}^{99} ( p + iq )

2100(cosπ6+isinπ6)100=299(p+iq){2}^{100}{\left(cos\dfrac{\pi}{6} + isin\dfrac{\pi}{6}\right)}^{100} = {2}^{99}\left(p + iq\right)

2100ei50π3=299(p+iq){2}^{100}{e}^{i\dfrac{50\pi}{3}} = {2}^{99}\left(p + iq\right)

2(cos50π3+isin50π3)=p+iq2\left(cos\dfrac{50\pi}{3} + isin\dfrac{50\pi}{3}\right) = p + iq

2(cos⁡(17π−π3)+isin(17π−π3))=p+iq2\left(\cos \left(17\pi - \dfrac{\pi}{3}\right) + isin\left(17\pi - \dfrac{\pi}{3}\right)\right) = p + iq

2(−cosπ3+isinπ3)=p+iq2\left(- cos\dfrac{\pi}{3} + isin\dfrac{\pi}{3}\right) = p + iq

2(−12+i32)=p+iq2\left(\dfrac{- 1}{2} + \dfrac{i\sqrt{3}}{2}\right) = p + iq

p=−1 and q=3p = - 1 \text{ and } q = \sqrt{3}

pp and qq Roots of the equation
x2−(3−1)x−3=0{x}^{2} - ( \sqrt{3} - 1 ) x - \sqrt{3} = 0

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