2x - 2/x = 3 হলে x3 - 1/x3 = কত?

2x - 2/x = 3 হলে x³ - 1/x³ = কত?

A 53

B 55

C 63/8

D 73

Solution

Correct Answer: Option C

দেওয়া আছে,
2x - 2/x = 3
2(x - 1/x) = 3
x - 1/x = 3/2

প্রদত্ত রাশি = x³ - 1/x³
= (x)³ - (1/x)³
= (x - 1/x)³ + 3.x.1/x.(x - 1/x)
= (3/2)³ + 3 × (3/2)
= (27/8) + (9/2)
= (27 + 36)/8
= 63/8

Solution

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