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If one root of the equation ax^2+bx+c=0,...

If one root of the equation `ax^2+bx+c=0,` is two times the other, then `b^2:ac=?`

A

`b^(2) = 9ac `

B

`2b^(2)` = 9ac

C

`2b^(2) = ` ac

D

`b^(2) ` = ac

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