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Q.

If the sum of the roots of the quadratic equation  ax2+bx+c=0  is equal to the sum of squares of reciprocals, then

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a

ab2,ca2,bc2  are in A.P.

b

ab2,ca2,bc2  are in G.P.

c

a2b,c2b,b2c  are in A.P.

d

None of these

answer is A.

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Detailed Solution

The given equation is ax2+bx+c=0

α,β  are the roots of given equation

Sum of the roots : α+β=ba

Product of the roots : αβ=ca

By the given condition, roots are equal to the sum of squares of reciprocals

 α+β =1α2+1β2

α+β=(α+β)22αβ(αβ)2

ba=b22acc2

bc2=ab22a2c

2a2c=bc2+ab2

This condition is satisfies Arithmetic progression

So  ab2,ca2,bc2  are in A.P. is correct option.

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