Question

If x-1/x=7 find the value of x3-1/x3

Answer 1

Answer:

Step-by-step explanation:

x-1/x=7

(x-1/x)^3=7^3

x^3-1/x^3-3(x)(1/x)(x-1/x)=343

x^3-1/x^3-3(7)=343

x^3+1/x^3-21=343

x^3+1/x^3=364

Answer 2

Answer:

-2/5 is the answer for the question