যদি x+1/x = 4  হয় , তাহলে x/(x2-3x+1)  এর  মান কত?

A 1

B 2

C -1

D 1/2

Solution

Correct Answer: Option A

 Here,
x+1/x=4
or, (x2+1)/x = 4
or, x2+1 =4x

now,
x/(x2-3x+1)  
= x/(x2+1-3x)                     
= x/(4x-3x)                   
= x/x                   
=1

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