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Question

The roots of the quadratic equation 3x22(7+9p)+(85p)=0 are reciprocal to each other, then find the value fo p.

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Solution

Let the roots of the given quadratic equation
3x22(7+9p)+(85p)=0 be α,1α.
Then from the relation between the roots and co-efficients we get,
α.1α=(85p)3
or, 85p=3
or, 5=5p
or, p=1.

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