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1 . x=4 +3

A. $5 \sqrt{3}$
B. $52$
C. $5 \sqrt{2}$
D. $2 \sqrt{5}$

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Answer: Option B

Explanation:

x = √4+√3

1/x = (√4-√3)/(4-3)= √4-√3

x+1/x = 2√4 = 4

Now,

x3+1/x3 = (x+1/x)3 – 3 . x . 1/x (x + 1/x)

= 43 – 3×4

= 64 - 12

= 52

৪৩ তম বিসিএস প্রিলিমিনারি টেস্ট (29-10-2021)

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