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Q.

If α≠β but α2=5α-3 and β2=5β-3, then the equation whose roots are α/β and β/α is

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a

3x2-25x+3=0

b

x2+5x-3=0

c

x2-5x+3=0

d

3x2-19x+3=0

answer is D.

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Detailed Solution

α2-5α+3=0     ...(i)β2-5β+3=0    ...(ii) From (i)-(ii), ⇒(α2-β2)-5α+5β=0⇒α2-β2=5(α-β)⇒α+β=5From (i)+(ii),⇒(α2+β2)-5(α+β)+6=0⇒(α2+β2)-5.5+6=0⇒α2+β2=19Then (α+β)2=α2+β2+2αβ⇒25=19+2αβ⇒αβ=3then the equation, whose roots are αβ and βα isx2-x(αβ+βα)+αβ.βα=0⇒x2-x(α2+β2αβ)+1=0⇒x2-x.193+1=0⇒3x2-19x+3=0
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If α≠β but α2=5α-3 and β2=5β-3, then the equation whose roots are α/β and β/α is