If a, b, c belong to R, and equations x^...

If a, b, c belong to R, and equations `x^2+2x+9=0` and `ax^2+bx+c=0` have a common root, then a: b: c is

A

`1:2:9`

B

`2:1:7`

C

`1:3:9`

D

`1:2:4`

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The correct Answer is:

A

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