যদি x2 + 1 = √3x হয়, তাহলে x2 + 1/x2= কত?

A 2

B 1

D 3

Solution

Correct Answer: Option B

দেওয়া আছে, 
  x2 + 1 = √3x
বা, x2/x + 1/x = √3x/x
∴ x + 1/x = √3

প্রদত্ত রাশি = x2 + 1/x2
= (x + 1/x)2 - 2.x.1/x
= (√3)2 - 2
= 3 - 2
= 1

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