A) 18
B) 19
C) 20
D) 21
Correct Answer: B
Solution :
\[9{{x}^{2}}+\frac{9}{{{x}^{2}}}\] \[=9\,\left( {{x}^{2}}+\frac{1}{{{x}^{2}}} \right)=9\left[ {{\left( x-\frac{1}{x} \right)}^{2}}+2 \right]\] \[=9\left[ {{\left( \frac{1}{3} \right)}^{2}}+2 \right]=9\times \frac{19}{9}=\]You need to login to perform this action.
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