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B
194
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C
160
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D
142
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Solution
The correct option is B194 x+1x=4 Squaring both sides, =(x+1x)2=42 =x2+(1x)2+2(x)(1x)=16 =x2+1x2+2=16 =x2+1x2=14 Again Squaring both sides,we get, =(x2+1x2)2=142 =(x2)2+(1x2)2+2(x2)(1x2)=196 =x4+1x4=196−2 =x4+1x4=194