The graph of a quadratic polynomial \( y=a x^{2} \) \( +b x+c ; a, b, c \in R \) is as shown. Wh...

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The graph of a quadratic polynomial \( y=a x^{2} \) \( +b x+c ; a, b, c \in R \) is as shown.
Which one of the following is not correct?
(a) \( b^{2}-4 a c0 \)
(b) \( \frac{c}{a}0 \)
(c) \( c \) is negative
(d) Abscissa corresponding to the vertex is \( \left(-\frac{b}{2 a}\right) \)
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