Q.

If α, β are the roots of the equation x2−5+3log3⁡5−5log5⁡3x+33log3⁡513−5log5⁡323−1=0 then the equation, whose roots are α+1β and β+1α,

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a

3x2 – 10x – 4 = 0

b

3x2 – 10x + 2 = 0

c

3x2 – 20x + 16 = 0

d

3x2 – 20x – 12 = 0

answer is B.

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Detailed Solution

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Bonus because ‘x’ is missing the correct will be,

x2−5+3log3⁡5−5log5⁡3x+33log3⁡513−5log5⁡323−1=03log3⁡5=3log3⁡5⋅log3⁡5⋅log5⁡3=3log3⁡5⋅log5⁡3=3log3⁡5log5⁡3=5log5⁡33log3⁡53=3log3⁡5⋅log5⁡323=3log3⁡5log5⁡32/3                                                =5log5⁡32/3

So, equation is x2 – 5x – 3 = 0 and roots are α & β

α+β=5; αβ=-3

New roots are α+1β & β+1α

i.e., αβ+1β & αβ+1α  i.e., -2β & -2α

Let -2α=t ⇒ α=-2t

As α2-5α-3=0

⇒−2t2−5−2t−3=0⇒4t2+10t−3=0⇒4+10t−3t2=0⇒3t2−10t−4=0 i.e., 3x2−10x−4=0

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If α, β are the roots of the equation x2−5+3log3⁡5−5log5⁡3x+33log3⁡513−5log5⁡323−1=0 then the equation, whose roots are α+1β and β+1α,