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The expression x^2-4px+q^2> 0 for all r...

The expression `x^2-4px+q^2> 0` for all real x and also `r^2+ p^2 < qr` the range of `f(x) = (x+r) / (x^2 +qx + p^2)` is

A

(a)`[p/(2r),q/(2r)]`

B

(b)`(0,infty)`

C

(c)`(-infty,0)`

D

(d)`(-infty, infty)`

Text Solution

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The correct Answer is:
D
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