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

A 2

B 1

C - 1

D 1/2

Solution

Correct Answer: Option B

দেওয়া আছে, 
x + 1/x = 4
⇒ (x2 + 1)/x = 4
⇒ x2 + 1 = 4x

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

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