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If a and b (ne 0) are roots of the equat...

If `a and b (ne 0)` are roots of the equation `x^(2) +ax+b=0`, then the least value of `x^(2)+ax+b (x in R)` is

A

`(9)/(4)`

B

`-(1)/(4)`

C

`(1)/(4)`

D

`-(9)/(4)`

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The correct Answer is:
D
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