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If one root of the equations A x ^(2) ...

If one root of the equations ` A x ^(2) + b x + c = 0 ` is two and a half times the others, then which of the following is TRUE ?

A

`7B^2=3 CA`

B

`7B^2=4 CA`

C

`7B^2=36 CA`

D

`10B^2=49 CA`

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