Challenger App

No.1 PSC Learning App

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

A21

B12

C14

D8

Answer:

C. 14

Read Explanation:

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)


Related Questions:

a^x = b , b^y = c , c^z = a ആയാൽ xyz എത്ര
(x+1)/(x-2)=4 ആയാൽ x എത്ര ?
The non-homogeneous system of linear equations in matrix form AX = B in ‘n’ unknowns has a unique solution if
Six persons A, B, C, D, E, F are sitting in a circle looking at the centre of the circle. A is sitting facing B. B is sitting to the right of E and left of C. A is sitting to the left of F and right of D. If the positions of A and E are interchanged, who will be sitting between A and C?
If a+b = 8 and ab = 15. then a³+b³ is