Question

if x=√5+2 then x-1/x is​

Answer 1

x=√5+2

put the value of  x  in polynomial x-1/x

√5+2 - 1/√5+2

factorize the denominator  for use the identity (a +b)(a - b) = a² - b²

√5+2 - 1/√5+2 × √5 - 2/√5 - 2

√5+2 - √5 - 2/(√5+2)(√5 - 2)

√5+2 - √5 - 2/(√5)² - 2²

√5+2 - √5 - 2/ 5 -4

√5+2 - √5 - 2/1

√5+2 - √5 - 2

⇒0

answer is 0

Answer 2

Answer:

Ans is 4

Explanation:

plzz refer the image