A) \[a\] and \[c\] are of opposite sign
B) \[{{b}^{2}}+2\,ac=162\]
C) \[For\,\,c=-\,15,\,\,a-b=1+8\,\sqrt{3}\]
D) \[ab=8\,\sqrt{3}\]
E) None of these
Correct Answer: C
Solution :
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