If x = (5)/(2!.3) + (5.7)/(3!.3^2) + (5....

If `x = (5)/(2!.3) + (5.7)/(3!.3^2) + (5.7.9)/(4!.3^3) + ……..oo` , then show that `x^2 + 4x = 23`

A

`sqrt3`

B

`root(3)(3)`

C

`3sqrt3`

D

`2sqrt3`

Verified by Experts

The correct Answer is:

C

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