Question

if x +1/x=4 find the value of the x-1/x

Answer 1

$x + 1 = 4x$
$3x = 1$
$x = \frac{1}{3}$
so now
$\frac{x - 1}{x} = \frac{ \frac{1}{3} - 1 }{ \frac{1}{3} }$
$= \frac{ \frac{ - 2}{3} }{ \frac{1}{3} }$
$= - 2$