A) < 0
B) = 0
C) > 0
D) None of these
Correct Answer: D
Solution :
Using the condition\[\Delta =0\] \[\Rightarrow ACF+2.\frac{E}{2}.\frac{D}{2}.B-A.{{\left( \frac{E}{2} \right)}^{2}}-C\,.\,{{\left( \frac{D}{2} \right)}^{2}}-F.{{(B)}^{2}}=0\].
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