Question

if x^3+1/x^3 =27, what is the value of x+1/x=?​

Answer 1

Answer:

x cube +1/ x cube = 27

x cube +1 = 27x cube

27 cube - x cube =1

26x cube =1

x cube = 1/26

x = 1/ root 26

so , x+1/x =( 1/root 26 )+1 / (1/root 26)={(1/root 26 )+1}into root 26= 1 + root 26