x+1/x =-1 হলে x³+1/x³ এর মান কত ?

A 1

B 2

C 3

D 4

Solution

Correct Answer: Option B

দেওয়া আছে , x+1/x =-1
অতএব, x³+1/x³ =( x+1/x )³
          =(-1)³-2.(-1)
          =-1+3
          =2

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