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

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

A

`(4)/(9)`

B

`(-4)/(9)`

C

`(9)/(4)`

D

`(-9)/(4)`

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The correct Answer is:

D

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