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Let f (x) =x ^(2) + bx + c AA in R, (b,c...

Let `f (x) =x ^(2) + bx + c AA in R, (b,c, in R) ` attains its least value at `x =-` and the graph of `f (x)` cuts y-axis at `y =2.`
If `f (x) =a` has two distinct real roots, then comlete set of values of a is :

A

`(1,oo) `

B

`(-2,-1)`

C

`(0,1)`

D

`(1,2)`

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The correct Answer is:
A
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