Question

x-(1/x) =2 ആയാൽ x³-(1/x³) ന്റെ വിലയെന്ത്?

• A. 21
• B. 12
• C. 14
• D. 8

Answer 1

Answer:

C. 14

x-(1/x)=2 ആയാൽ (x-(1/x))³ =2³ =8 x³ - (1/x)³ -3x × 1/x( x - 1/x)= 8 x³ - 1/x³ - 3×1×2 =8 x³ - 1/x³ = 8+6 =14 (a-b)³ = a³ - b³ - 3ab(a-b)