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IF the harmonic mean between the ro...

IF the harmonic mean between the roots of ` (5 + sqrt(2))x^2-bx +(8+2sqrt(5))=0` is 4 then value of b is

A

2

B

3

C

`4-sqrt5`

D

`4+sqrt5`

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The correct Answer is:
D
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AAKASH SERIES-QUADRATIC EQUATIONS & EXPRESSIONS-EXERCISE-I
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