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If a and b(!=0) are the roots of the equ...

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

A

`9/4`

B

`-(9)/4`

C

`-(1)/(4)`

D

`(1)/4`

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The correct Answer is:
B
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