Question

if x= 2+√5 find the value of x²+1/x²​

Answer 1

Answer:

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x square + 1/x square

put the value of x = 2 +√5

(2 +√5 ) square + 1/ (2 +√5 ) square

4 +5 +1/4+5

9 + 1/9

Take the L.C.M

L.C.M = 9

81 +1/ 9

82/9

The value of x =82/9