Question

if x=2^1/3 +2^-1/3 then value of 2x^3-6x is​

Answer 1

x= 2/3 +3/2

x =( 4+9)/6

x = 13/6

then

6x=13

so,

2x^3-6x

x(2x^2-6x)

x( 2*(13/6)^2-6x)

x(2*169/36-6x)

x(169/18-13)

x((169-234)/18)

13/6(-65/18)

-845/108