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If q^2 - 4pr =0 , p gt 0 then the domain...

If `q^2 - 4pr =0 , p gt 0` then the domain of the function `f(x) = log(p x^3 +(p+q)x^2 +(q+r) x + r)` is

A

`R-{-q/(2p)}`

B

`R-[(-oo,-1]uu{-1/(2p)}]`

C

`R-[(-oo,-1)nn{-1/(2p)}]`

D

`R`

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The correct Answer is:
B
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