Question

x^2+1/x^2 =27,find the value of x^3-1/x^3​

Answer 1

x^2 + 1

-------- = 27

x^2

=> x^2 + 1 = 27x^2

=> 26x^2 = 1

=> x^2 = 1/26 = 0.038

=> x = 0.194

Now,

x^3 - 1

----------- =1 -1/x^3 = 1 - 1/(0.194)^3

x^3

=1-1/0.007

= 1 - 142.857

= - 141.857

Answer 2

Yes, above is correct that .