M –1/m= 2 হলে, m4 +1/m4 = কত ?
Solution
Correct Answer: Option B
দেয়া আছে, m-1/m=2
সুতরাং , m4 + 1/m4 =(m2 )2+(1/m2 )2 =(m2 +1/m2)2 -2.m2.1/ m2
={(m-1/m)2 +2.m.1/m}2-2 =(22 +2)2-2 =62-2= 34
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