Question

if x =under root 5 +2 then value of x-1/x​

Answer 1

Answer:

$\sqrt{5} + 2 + \frac{1}{ \sqrt{5} + 2 }$

1.Rationalize the denominator -

1 / √5+2 × √5-2/√5-2 = √5-2/ 5-4 = √5-2/1 = √5-2

x - 1/x = √5+2-√5-2 = 0