Q 1113356240.     If the harmonic mean between the roots `(5+sqrt2)x^2-bx+(8+2sqrt5)=0` is `4`, then the value of `b`

EAMCET 2013
A

`2`

B

`3`

C

`4-sqrt5`

D

`4+sqrt5`

HINT

Harmonic Mean `= (2alphabeta)/(alpha+beta)`

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