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If a >0 and discriminant of a x^2+2b x+...

If `a >0` and discriminant of `a x^2+2b x+c` is negative, then `|[a,b,ax+b],[b,c,bx+c],[ax+b,bx+c,0]|` is `+v e` b. `(a c-b)^2(a x^2+2b x+c)` c. `-v e` d. `0`

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