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The roots of the equation (a+sqrtb)^(x^...

The roots of the equation
`(a+sqrtb)^(x^2-15)`+`(a-sqrtb)^(x^2-15)`=2a where `(a^2-b)=1` are

A

+-3

B

`+-4`

C

`+-sqrt14` and `+-4`

D

`+-sqrt5`

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The correct Answer is:
B, C
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