A) 56
B) 74
C) 47
D) 60
Correct Answer: C
Solution :
(c): Since \[\left( x+\frac{1}{x} \right)=3,\], then \[{{x}^{2}}+\frac{1}{{{x}^{2}}}=7\,\,\,\,\Rightarrow {{x}^{4}}+\frac{1}{{{x}^{4}}}=47.\]You need to login to perform this action.
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