Question

Solve if x+1/x=o,find the value of(x+1/x)3=?

Answer 1

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

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

Answer 2

I hope the answer is0