If x+1/x=3, then x^3+1/x^3 is equal to:

SSC CHSL Model Paper 11

Question : 62 of 100

Marks: +1, -0

x+1/x=3

, then

x^3+1/x^3

is equal to:

Solution:

x+1/x=3

x^3+1/x^3=(x+1/x)^3

-3×x×1/x(x+1/x)

= (3)^3 - 3×3

= 27- 9= 18

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