Question

if x=√5 - 2 then find the value of x²+1/x²​

Answer 1

Answer:

2

Step-by-step explanation:

x = √5-2

Sq both sides,we get

x² = √5²-2²

Since, a²-b²=(a+b)(a-b)

Therefore,

x²= (√5+2) (√5-2)

= 5-2√5+2√5-4

= 1

x²+1/x²:-

= 1+1/1

=2/1

=2

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