x- 1/x=7 হলে x3- 1/x3 এর মান কত?
Solution
Correct Answer: Option C
দেওয়া আছে,x- 1/x=7
x3- 1/x3 =(x- 1/x)3+3.x.1/x(x- 1/x)
=73+3.7
= 343+21
= 364
x3- 1/x3 =(x- 1/x)3+3.x.1/x(x- 1/x)
=73+3.7
= 343+21
= 364
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