A) \[{{x}^{2}}+\frac{9}{{{x}^{2}}}-18\]
B) \[{{x}^{3}}+\frac{9}{{{x}^{3}}}-6\]
C) \[{{x}^{2}}+\frac{9}{{{x}^{2}}}-6\]
D) \[{{x}^{2}}+\frac{1}{{{x}^{2}}}-6\]
Correct Answer: C
Solution :
(c): use formula \[{{\left( a-b \right)}^{2}}={{a}^{2}}+{{b}^{2}}-2ab\text{ }.\]
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