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ID#3061 BCS General Math Preli (36)

x – 1/x = 1 হলে, x³ – 1/x³ = কত?
ক)
খ)
গ)
ঘ)

ব্যাখ্যা

আমরা জানি,
$a^3 - b^3 = (a - b)^3 + 3ab(a - b)$

প্রদত্ত রাশি,
$x^3 - \frac{1}{x^3} = (x - \frac{1}{x})^3 + 3 \cdot x \cdot \frac{1}{x} (x - \frac{1}{x})$

মান বসিয়ে পাই,
$= (1)^3 + 3(1)$
$= 1 + 3$
$= 4$

উত্তর: 4
Resource Details
Exam BCS
Subject General Math
Chapter 12
Year 36

Discussion — BCS General Math Preli (36)

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