x2 - 4x + 1 = 0 হলে x2 - 1/x2 এর মান কত?
Solution
Correct Answer: Option D
দেওয়া আছে, x2-4x+1=0
⇒ x2+1=4x
⇒ x+1/x=4
Xx
.: প্রদত্ত রাশি = x2 - 1/x2
= (x+1/x)(x-1/x)
=4.√(x+1/x)2-4.x,1/x
=4.√42-4
=4.√16-4
=4√12
=8√3
⇒ x2+1=4x
⇒ x+1/x=4
Xx
.: প্রদত্ত রাশি = x2 - 1/x2
= (x+1/x)(x-1/x)
=4.√(x+1/x)2-4.x,1/x
=4.√42-4
=4.√16-4
=4√12
=8√3
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