Question

if x+1/x=4, then x^2 + 1/(x^2) = ?

Answer 1

x+1/x=4

then,

(x+1/x)^2 =4^2

x^2 + 1/x^2 + 2*x*1/x = 16

x^2 + 1/x^2 =16 -2 = 14

hope it helps u.