Question

if x plus 1 by x equals to 7 then find the value of x cube plus 1 by x cube​

Answer 1

Step-by-step explanation:

if x+1/x=7 then find x^3+1/x^3

solution:

x+1/x=7

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

x^3+1/x^3+3x.1/x(x+1/x)=343

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

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

x^3+1/x^3=322