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If all the three roots of az^(3)+bz^(2)+...

If all the three roots of `az^(3)+bz^(2)+cz+d=0` have negative real parts `(a,b,c, in R)` , then

A

`ab gt 0`

B

`bc gt 0`

C

`ad gt 0`

D

`bc-ad gt 0`

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The correct Answer is:
A, B, C, D
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