2x-(2/x)=3 হলে , 8x3 - (1/x3) এর মান কত?

 

A 60

B 64

C 63

D 69

Solution

Correct Answer: Option C

দেওয়া আছে,

2x-(2/x)=3

⇒2{x-(1/x)}=3

⇒x-(1/x) = 3/2

∴প্রদত্ত রাশি = 8(x3 - (1/x3)

=8[{x-(1/x)3 + 3.x.1/x{x-(1/x)}]

=8{(3/2)3+3.3/2}

=8{(27/8)+(9/2)}

=8×(63/8)=63

 

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