Question

(x+1/x)=4 then find (x-1/x)

Answer 1

given,

x+1/x=4

squaring on both sides

(x+1/x)²=4²

x²+1/x²+2*x*1/x=16

x²+1/x²=14

now (x-1/x)²=x²+1/x²-2=14-2=12

x-1/x=√12

Answer 2

Ans with statement is in attachment