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The roots of ax^(2) + 2bx + c = 0 and bx...

The roots of `ax^(2) + 2bx + c = 0` and `bx^(2)- 2sqrt(ac)x+b=0` are simultaneously real, then

A

a=b, c=0

B

`ac= b^(2)`

C

`4b^(2)=ac`

D

`ab=c^(2)`

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The correct Answer is:
D
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