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Let f(x)=a x^(2)+b x+c, a ne 0 and Delta...

Let f`(x)=a x^(2)+b x+c`, `a ne 0` and` Delta=b^(2)-4 a c` . If `alpha+beta, alpha^(2)+beta^(2)` and `alpha^(3)+beta^(3)` are in G.P, then

A

`Delta ne 0`

B

`Delta=0`

C

`c Delta=0`

D

b c ne 0

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The correct Answer is:
A
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