Question

x+1/x =3 then x^3+1/x^3 is

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Answer 1

Answer:

18

Step-by-step explanation:

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Answer 2

Answer:

Step-by-step explanation:

Given , x+1/x =3

We know a^3 +b^3 = (a+b)^3 - 3ab(a+b)

∴ x^3 + 1/x^3

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

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

=(3)^3 -3*1*3 { as x+1/x =3}

=27 - 9

= 18