1.

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

Answer»
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


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