(x2 + 1)2 = 5x2 হলে x - 1/x এর মান কোনটি?
Solution
Correct Answer: Option B
দেওয়া আছে,
(x2 + 1)2=5x²
বা,x²+1=√5x
বা,(x²+1)/x=√5
বা,x + 1/x =√5
বা, (x-1/x)² =(x+1/x)²-4.x.1/x
=(√5)²-4
=5-4
=1
(x2 + 1)2=5x²
বা,x²+1=√5x
বা,(x²+1)/x=√5
বা,x + 1/x =√5
বা, (x-1/x)² =(x+1/x)²-4.x.1/x
=(√5)²-4
=5-4
=1
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