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QJEEM24Mafbcf: JEE Main 2024 Mathematics - Class 11 JEEM24Mafbcf Solution: Let be the roots of the equation . The quadratic equation,…

Let α,β\alpha, \beta be the roots of the equation x2+22x−1=0x^2+2 \sqrt{2} x-1=0 . The quadratic equation, whose roots are α4+β4\alpha^4+\beta^4 and 110(α6+β6)\frac{1}{10}(\alpha^6+\beta^6) , is:

Multiple Choice Options

  • A x2−180x+9506=0x^2-180 x+9506=0
  • B x2−195x+9506=0x^2-195 x+9506=0
  • C x2−190x+9466=0x^2-190 x+9466=0
  • D x2−195x+9466=0x^2-195 x+9466=0

Step-by-Step Verified Solution

amp;x2+22x−1=0amp;α+β=−22 and αβ=−1amp;α2+β2=(α+β)2−2αβamp;=8+2=10amp;α4+β4=(α2+β2)2−2(αβ)2amp;=100−2=98amp;α6+β6=(α2+β2)3−3α2β2(α2+β2)amp;=1000−3(10)amp;=970amp;∴110(α6+β6)=97\begin{aligned}& x^2+2 \sqrt{2 x}-1=0 \\& \alpha+\beta=-2 \sqrt{2} \text { and } \alpha \beta=-1 \\& \alpha^2+\beta^2=(\alpha+\beta)^2-2 \alpha \beta \\& =8+2=10 \\& \alpha^4+\beta^4=\left(\alpha^2+\beta^2\right)^2-2(\alpha \beta)^2 \\& =100-2=98 \\& \alpha^6+\beta^6=\left(\alpha^2+\beta^2\right)^3-3 \alpha^2 \beta^2\left(\alpha^2+\beta^2\right) \\& =1000-3(10) \\& =970 \\& \therefore \quad \frac{1}{10}\left(\alpha^6+\beta^6\right)=97\end{aligned}

Equation whose roots are α4+β4\alpha^4+\beta^4 and 110(α6+β6)\frac{1}{10}\left(\alpha^6+\beta^6\right) is

amp;x2−(98+97)x+98×97=0amp;x2−195x+9506=0\begin{aligned}& x^2-(98+97) x+98 \times 97=0 \\& x^2-195 x+9506=0\end{aligned}

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